Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
• An ISA is the Controlled
Assessment Unit for
Science.
• It is worth 25% of your
GCSE.
• There is no tier of
assessment so grades
range from U - A*.
• You only need to
complete one ISA per
GCSE but there are three
available ISA’s for each
GCSE.
• Each ISA is made up of 4
parts
–
–
–
–
Research
Section 1 exam
Practical
Section 2 exam
• ISA’s are done in lesson
time and take
approximately 7 lessons.
• Your best ISA grade will
be the mark sent to the
exam board.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
1
• Introduce the context of the investigation
2
• Planning and preparation
3
• Complete the planning sheet and write a blank table
4
• ISA section 1 exam
5
• Practical
6
• Complete practical and draw a graph of your results
7
• ISA section 2 exam
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
Science A
BU1.3 Vitamin C
CU1.3 Carbonate Ores
PU1.3 Reflection
Hypothesis - ‘How much vitamin
C is in food depends upon the
time the food is cooked for.’
Hypothesis - ‘The amount of
carbonate in an ore sample can
be measured by adding
hydrochloric acid to the sample
until it stops fizzing.’
Hypothesis - ‘The angle of
reflection depends upon the angle
of incidence’.
Suggested contexts - preparing
diets for hospital patients or
malnourished people or showing
household cooks how to retain
vitamins in cooked food
Suggested contexts - where to
locate a quarry to obtain ore from,
or comparing ores to determine
the location likely to produce the
most metal
Suggested contexts - rear view
mirrors in cars, or periscopes.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
Additional Science
BU2.3 Field work
CU2.3 Electrolysis
PU2.3 Resistance
Investigate the effect of a
physical factor that may affect
the growth of plants in their
natural environment
Investigate a factor that may
affect the mass of metal
deposited on the negative
electrode during electrolysis
Investigate a factor that may
affect the resistance of a
filament bulb
Suggested contexts - differences
between leaves of one species of
plant growing in different light
intensities or the distribution of
Pleurococcus on trees
Suggested contexts - the
electroplating of an object such as a
watch case, piece of car trim or
mobile phone case
Suggested contexts - filament
lamps in homes, car headlamps or
torch bulbs
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
Biology
BU2.3 Field work
BU3.3a Stomata
BU3.3b Sweat
Investigate the effect of a
physical factor that may
affect the growth of plants
in their natural environment
Investigate a factor that
may affect the number of
stomata on leaf surfaces
Investigate a factor that
may affect how quickly
sweating cools the body
Suggested contexts - differences
between leaves of one species of
plant growing in different light
intensities or the distribution of
Pleurococcus on trees
Suggested contexts - why plants
normally found in aquatic / marsh
conditions do not survive in arid
conditions or why roses do not grow
well in sandy soil
Suggested contexts - the problem
of overcooling on windy days or the
design of materials for use as
clothing for athletes or for outdoor
activities
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
Chemistry
CU2.3 Electrolysis
CU3.3a Sports Injury
Pack
CU3.3b Titrations
Investigate a factor that may
affect the mass of metal deposited
on the negative electrode during
electrolysis
Investigate a factor that affects
the change in temperature when a
salt is dissolved in water to
produce an endothermic reaction
Investigate a factor that affects
the neutralisation of an acid
Suggested contexts - the
electroplating of an object such as
a watch case, piece of car trim or
mobile phone case
Suggested contexts manufacturing cool packs for
sports injuries, or cooling packs
for insulated food carriers
Suggested contexts - the use of
antacids for indigestion
treatments, neutralisation of acidrain polluted lakes
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
Physics
PU2.3 Resistance
PU3.3a Transformers
PU3.3b
Electromagnets
Investigate a factor that may
affect the resistance of a
filament bulb
Investigate a factor that may
affect the potential difference
across the secondary coil of a
transformer
Investigate a factor that may
affect the strength of an
electromagnet
Suggested contexts filament lamps in homes, car
headlamps or torch bulbs
Suggested contexts transformers for doorbells,
mobile phones or laptops
Suggested contexts electromagnetic cranes,
relays or magnetic door bolts
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
1
• Introduce the context of the investigation
Context:
• Your teacher will describe the context in which the investigation is set.
Relating the investigation to the context
• Your teacher will describe the context in which the investigation is set.
• You must research this context and write down how the results of your investigation might be useful, e.g. health
and safety developments, energy efficiency, in industry, etc.
You may be asked a question similar to this in the
section 2 exam:
• How could the results from your investigation be
useful in the context that you have researched?
• You may use information from your Candidate
Research Notes to help you to answer this question.
3 marks
Marks
Guidance
0
No credit worthy response
1
An idea from the research has been related to the
context
2
An idea from the research has been related to the
context and there is a simple explanation of how the
idea can be applied and used in the given context
3
An idea from the research has been related to the
context and there is a detailed explanation of how
this idea can be applied in the given context
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
1
• Introduce the context of the investigation
An example of a poor
answer
An example of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
2
• Planning and preparation
Research:
• Once you have been given the context of the investigation you will need to research:
–one or two possible methods of carrying out the investigation
–the context that has been set
–any health and safety issues with the method(s)
• These research notes must be written on the Candidate Research notes sheet provided by AQA
• Your research should take no more than 3 hours, including homework. In an Additional Science ISA or
Separate Science ISA you will also need to use some of this time to come up with a hypothesis.
• Your teacher will check your notes before you take the Section 1 exam to ensure you have not included an
prohibited information.
Remember these are only supposed to be brief notes but they should include information on the factors such
as the range, interval and number of repeat readings that you should take, and the variables that need to be
controlled.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
2
• Planning and preparation
Hypothesis:
For a Science A ISA you will be given the hypothesis
For an Additional Science ISA you will need to come up with a
hypothesis
Research sources
List all of the sources you used to carry out your research, such
as books, websites or CD-ROMs.
Which source was the most useful and why?
Method(s)
Briefly outline a possible method that could be used to collect
useful data to investigate the hypothesis. Think about what you
will change, what you will control and what you will measure.
Equipment
List all the equipment you would need for your method. Think
about how you will set your investigation up and what you will
need to measure. Select the most suitable equipment to do this.
You may want to draw a diagram.
Risk assessment issues
Record any possible hazards in each method, and the risks they
present. Explain how you will reduce these.
E.g. acid is an irritant and can cause holes in clothes. To reduce
this risk I will wear goggles, wipe up spills and wash my hands.
Relating the investigation to the context
Your teacher will describe the context in which the investigation is
set.
You must research this context and write down how the results of
your investigation might be useful, e.g. health and safety
developments, energy efficiency, in industry, etc.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
3
• Complete the planning sheet and write a blank table
Producing a blank table:
• You will be required to independently produce a blank table for your results.
• This is done under exam conditions once the research notes have been
completed and before you sit your Section 1 exam
• The table should be able to accommodate everything that the you are going
to measure and record during the investigation.
• The table should include appropriate headings and units.
Independent
variable
(units)
Marks
Guidance
0
No table or a table with
incomplete headings or units
for the measured variables.
Fewer than half of the
required elements are
present.
1
A table with incomplete
headings or units for the
measured variables.
At least half of the required
elements should be present.
2
Correct headings and units
present for all measured
variables.
Dependent variable (units)
Test 1
Test 2
Test 3
Mean
You may need to include
additional information (e.g.
start temp, end temp and
change in temp).
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
3
• Complete the planning sheet and write a blank table
All these tables scored full marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Section 1 Exam:
• Up to 45 minutes is allowed for this.
• The test may be taken in the normal teaching room,
provided that you can be accommodated in such a
way as to prevent any copying or unauthorised
collaboration. However the test will usually take
place in the hall, dance studio or drama studio
depending on their availability.
• If you normally have a reader, extra time, scribe etc.
for exams then you will have the same
arrangements made for the ISA exam.
• Section 1 of the ISA will contain questions about the
methods that you have researched and is worth 20
marks of the overall 50 allocated to the Controlled
Assessment.
• You may use your Candidate Research notes sheet,
which you filled in during your research.
Section 1 Exam:
There are normally 5 questions:
1.Name two sources you used and analyse their
usefulness
3 marks
2.Name a control variable and outline a preliminary
investigation to find a suitable value for this variable
3 marks
3.Describe your plan
9 marks
4.This question could be on a variety of different
topics relating to the idea “what makes a good
investigation” - some examples are given in this
guide
3 marks
5.Submit the blank table you have drawn for your
results
2 marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Research sources:
• List all of the sources you used to carry out your research, such as books, websites or CD-ROMs.
• Which source was the most useful and why?
You may be asked a question similar to this in the
section 1 exam:
• Think about the research that you did to find out
how to test this hypothesis.
• Identify two sources that you used for your
research.
• Which of these sources was the more useful?
• Why was this source better than the other source?
3 marks
Marks
Guidance
0
No credit worthy response
1
Two relevant sources are identified
2
Two relevant sources are clearly identified and the
usefulness of one of the sources is commented on
3
Two relevant sources are clearly identified and the
usefulness of both sources is explained and a
comparison made
Additional marking guidance:
• A clearly identified source is referred to by title and author or for • If candidates have taken part in peer discussion as part of their
websites at least the name of the website should be quoted
research, simply stating this is not sufficient to qualify for
• A clear comment on only one of the sources ay be sufficient to quoting a source. Similarly reference to their own notes or
exercise book alone is insufficient.
gain 2 marks if the answer implies a comment on the other
source.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Method(s):
• Briefly outline a possible method that could be used to collect useful data to investigate the hypothesis. Think
about what you will change, what you will control and what you will measure.
You may be asked a question similar to this in the
section 1 exam:
• In this investigation, you will need to control some of
the variables.
• Write down one variable that will need to be
controlled.
• Describe briefly how you would do a preliminary
investigation to find a suitable value to use for this
variable.
• You should also explain how the results of this
preliminary investigation will help you to decide on
the best value for this variable.
3 marks
Marks
Guidance
0
No credit worthy response
1
A suitable control variable is stated.
2
A suitable control variable is stated.
Only one value to be investigated in the preliminary
experiment is suggested.
The dependent variable is stated, but details
concerning its measurement are incomplete.
3
A suitable control variable is stated.
The limits of the range to be investigated in the
preliminary experiment are appropriate.
A statement concerning how the dependent variable
values obtained could be used to determine the best
value for the control variable has been made.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
You may be asked a question similar to this in the section 1 exam:
• In this question you will be assessed on using good English, organising • You should include:
information clearly and using specialist terms where appropriate.
– the equipment that you plan to use
• From the research that you have done, describe in detail how you are
– how you will use the equipment
going to do your investigation.
– the measurements that you are going to make
– how you will make it a fair test
– a risk assessment.
0 marks
9 marks
1, 2 & 3 marks
4, 5 & 6 marks
7, 8 & 9 marks
Equipment
Some of the necessary equipment is stated.
Most of the necessary equipment is stated.
Most of the necessary equipment is stated.
Method
The method described is weak but shows
some understanding of the sequence of an
investigation.
The method described will enable valid results to
be collected.
The method described will enable valid results to
be collected.
Measurements
The measurements to be made are stated.
The measurements to be made are stated and a
at least one control variable is given.
The measurements to be made are stated and
the significant control variables are clearly
identified, with details of how they will be
monitored or controlled.
An appropriate hazard is identified, but the
corresponding risk assessment and control
measure is weak or absent.
Any significant hazards are identified, together
with a corresponding control measure but the risk
assessment is weak or absent.
Any significant hazards are identified, together
with an assessment of the associated risks and
corresponding control measures.
Organisation
The answer is poorly organised, with almost
no specialist terms and little or no detail
given.
The answer has some structure and organisation,
use of specialist terms has been attempted but
not always correctly, and some detail is given.
The answer is coherent and written in an
organised, logical sequence, containing a range
of relevant specialist terms used correctly.
SPaG
The answer shows very weak spelling,
punctuation and grammar.
The answer shows reasonable spelling,
punctuation and grammar although there may still
be some errors.
The answer shows almost faultless spelling,
punctuation and grammar.
Risk
assessment
No
creditworthy
response
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Method(s):
• Briefly outline a possible method that could be used to collect useful data to investigate the hypothesis. Think
about what you will change, what you will control and what you will measure.
You may be asked a question similar to this in the
section 1 exam:
• In your research you will have found other methods
you could have used
• Briefly outline one other method you could have
used.
• Explain why you chose not to do this method
3 marks
Marks
Guidance
0
No credit worthy response
1
An alternative method is outlined briefly although some of
the necessary steps may not be clear
OR
A suggestion is given as to why this alternative method
would not have been as good as the one chosen
2
An alternative method is outlined briefly although some of the
necessary steps may not be clear
OR
A suggestion is given as to why this alternative method would
not have been as good as the one chosen
3
An alternative method is outlined in sufficient detail so that the
necessary steps are clear
OR
A sensible explanation is given as to why this alternative
method would not have been as good as the chosen one
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
An example of
a good answer
An example of
a poor answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Method(s):
• Briefly outline a possible method that could be used to collect useful data to investigate the hypothesis. Think
about what you will change, what you will control and what you will measure.
You may be asked a question similar to this in the
section 1 exam:
• When you have completed your investigation, you
will be asked to compare your results with others.
• Explain the advantages of comparing your results
with the results of others.
3 marks
Marks
Guidance
0
No credit worthy response
1
Allows you to check your results
OR
calculate a more accurate mean
2
Enables you to check your results with those of others to
see if there are any similarities or differences
OR
With more results you are able to calculate a more accurate
mean and minimize the effect of random errors
3
Enables you to check your results with those of others to
see if there are any similarities or differences
OR
With more results you are able to calculate a more accurate
mean and minimize the effect of random errors
OR
Enables reproducibility to be confirmed
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
An example of
a good answer
An example of
a poor answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Risk assessment issues:
• Record any possible hazards in each method, and the risks they present. Explain how you will reduce these.
• E.g. acid is an irritant and can cause holes in clothes. To reduce this risk I will wear goggles, wipe up spills
and wash my hands.
You may be asked a question similar to this in the
section 1 exam:
• Think about the hazards in your investigation.
• Describe one hazard in your investigation and say
how you would reduce any risks.
3 marks
Marks
Guidance
0
No credit worthy response
1
An appropriate hazard is identified, but the
corresponding risk assessment and control measure
is weak or absent
2
Any significant hazards are identified, together with
a corresponding control measure but the risk
assessment is weak or absent
3
Any significant hazards are identified, together with
an assessment of the associated risks and
corresponding control measures
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
Producing a blank table:
• You will be required to independently produce a blank table for your results.
• This is done under exam conditions once the research notes have been
completed and before you sit your Section 1 exam
• The table should be able to accommodate everything that the you are going
to measure and record during the investigation.
• The table should include appropriate headings and units.
Independent
variable
(units)
Marks
Guidance
0
No table or a table with
incomplete headings or units
for the measured variables.
Fewer than half of the
required elements are
present.
1
A table with incomplete
headings or units for the
measured variables.
At least half of the required
elements should be present.
2
Correct headings and units
present for all measured
variables.
Dependent variable (units)
Test 1
Test 2
Test 3
Mean
You may need to include
additional information (e.g.
start temp, end temp and
change in temp).
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Science A
All these tables scored full marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Section 1 Exam:
• Up to 45 minutes is allowed for this.
• The test may be taken in the normal teaching room,
provided that you can be accommodated in such a
way as to prevent any copying or unauthorised
collaboration. However the test will usually take
place in the hall, dance studio or drama studio
depending on their availability.
• If you normally have a reader, extra time, scribe etc.
for exams then you will have the same
arrangements made for the ISA exam.
• Section 1 of the ISA will contain questions about the
methods that you have researched and is worth 20
marks of the overall 50 allocated to the Controlled
Assessment.
• You may use your Candidate Research notes sheet,
which you filled in during your research.
Section 1 Exam:
There are normally 5 questions:
1.Write down and explain your hypothesis
3 marks
2.Name two sources you used and analyse their
usefulness
3 marks
3.Describe your plan
9 marks
4.This question could be on a variety of different
topics relating to the idea “what makes a good
investigation” - some examples are given in this
guide
3 marks
5.Submit the blank table you have drawn for your
results
2 marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Hypothesis:
• For a Additional Science or Separates Science ISA you need to come up with your own hypothesis that fits the
topic you have been asked to investigate
You may be asked a question similar to this in the
section 1 exam:
• Write down your hypothesis
• Explain why you made this hypothesis
3 marks
Marks
Guidance
0
No credit worthy response
1
There is a hypothesis that, by implication, identifies
the independent and dependent variables, but there
is no explanation.
2
There is a hypothesis that, by implication, identifies
the independent and dependent variables, however,
the explanation for this hypothesis is unclear.
3
There is a hypothesis that, by implication, identifies
the independent and dependent variables, The
hypothesis is explained clearly.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Research sources:
• List all of the sources you used to carry out your research, such as books, websites or CD-ROMs.
• Which source was the most useful and why?
You may be asked a question similar to this in the
section 1 exam:
• Think about the research that you did to find out
how to test this hypothesis.
• Identify two sources that you used for your
research.
• Which of these sources was the more useful?
• Why was this source better than the other source?
3 marks
Marks
Guidance
0
No credit worthy response
1
Two relevant sources are identified
2
Two relevant sources are clearly identified and the
usefulness of one of the sources is commented on
3
Two relevant sources are clearly identified and the
usefulness of both sources is explained and a
comparison made
Additional marking guidance:
• A clearly identified source is referred to by title and author or for • If candidates have taken part in peer discussion as part of their
websites at least the name of the website should be quoted
research, simply stating this is not sufficient to qualify for
• A clear comment on only one of the sources ay be sufficient to quoting a source. Similarly reference to their own notes or
exercise book alone is insufficient.
gain 2 marks if the answer implies a comment on the other
source.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
You may be asked a question similar to this in the section 1 exam:
• In this question you will be assessed on using good English, organising • You should include:
information clearly and using specialist terms where appropriate.
– the equipment that you plan to use
• From the research that you have done, describe in detail how you are
– how you will use the equipment
going to do your investigation.
– the measurements that you are going to make
– how you will make it a fair test
– a risk assessment.
0 marks
9 marks
1, 2 & 3 marks
4, 5 & 6 marks
7, 8 & 9 marks
Equipment
Some of the necessary equipment is stated.
Most of the necessary equipment is stated.
Most of the necessary equipment is stated.
Method
The method described is weak but shows
some understanding of the sequence of an
investigation.
The method described will enable valid results to
be collected.
The method described will enable valid results to
be collected.
Measurements
The measurements to be made are stated.
The measurements to be made are stated and a
at least one control variable is given.
The measurements to be made are stated and
the significant control variables are clearly
identified, with details of how they will be
monitored or controlled.
An appropriate hazard is identified, but the
corresponding risk assessment and control
measure is weak or absent.
Any significant hazards are identified, together
with a corresponding control measure but the risk
assessment is weak or absent.
Any significant hazards are identified, together
with an assessment of the associated risks and
corresponding control measures.
Organisation
The answer is poorly organised, with almost
no specialist terms and little or no detail
given.
The answer has some structure and organisation,
use of specialist terms has been attempted but
not always correctly, and some detail is given.
The answer is coherent and written in an
organised, logical sequence, containing a range
of relevant specialist terms used correctly.
SPaG
The answer shows very weak spelling,
punctuation and grammar.
The answer shows reasonable spelling,
punctuation and grammar although there may still
be some errors.
The answer shows almost faultless spelling,
punctuation and grammar.
Risk
assessment
No
creditworthy
response
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Method(s):
• Briefly outline a possible method that could be used to collect useful data to investigate the hypothesis. Think
about what you will change, what you will control and what you will measure.
You may be asked a question similar to this in the
section 1 exam:
• In your research you will have found other methods
you could have used
• Briefly outline one other method you could have
used.
• Explain why you chose not to do this method
3 marks
Marks
Guidance
0
No credit worthy response
1
An alternative method is outlined briefly although some of
the necessary steps may not be clear
OR
A suggestion is given as to why this alternative method
would not have been as good as the one chosen
2
An alternative method is outlined briefly although some of the
necessary steps may not be clear
OR
A suggestion is given as to why this alternative method would
not have been as good as the one chosen
3
An alternative method is outlined in sufficient detail so that the
necessary steps are clear
OR
A sensible explanation is given as to why this alternative
method would not have been as good as the chosen one
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
An example of
a good answer
An example of
a poor answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Method(s):
• Briefly outline a possible method that could be used to collect useful data to investigate the hypothesis. Think
about what you will change, what you will control and what you will measure.
You may be asked a question similar to this in the
section 1 exam:
• When you have completed your investigation, you
will be asked to compare your results with others.
• Explain the advantages of comparing your results
with the results of others.
3 marks
Marks
Guidance
0
No credit worthy response
1
Allows you to check your results
OR
calculate a more accurate mean
2
Enables you to check your results with those of others to
see if there are any similarities or differences
OR
With more results you are able to calculate a more accurate
mean and minimize the effect of random errors
3
Enables you to check your results with those of others to
see if there are any similarities or differences
OR
With more results you are able to calculate a more accurate
mean and minimize the effect of random errors
OR
Enables reproducibility to be confirmed
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
An example of
a good answer
An example of
a poor answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Risk assessment issues:
• Record any possible hazards in each method, and the risks they present. Explain how you will reduce these.
• E.g. acid is an irritant and can cause holes in clothes. To reduce this risk I will wear goggles, wipe up spills
and wash my hands.
You may be asked a question similar to this in the
section 1 exam:
• Think about the hazards in your investigation.
• Describe one hazard in your investigation and say
how you would reduce any risks.
3 marks
Marks
Guidance
0
No credit worthy response
1
An appropriate hazard is identified, but the
corresponding risk assessment and control measure
is weak or absent
2
Any significant hazards are identified, together with
a corresponding control measure but the risk
assessment is weak or absent
3
Any significant hazards are identified, together with
an assessment of the associated risks and
corresponding control measures
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
Producing a blank table:
• You will be required to independently produce a blank table for your results.
• This is done under exam conditions once the research notes have been
completed and before you sit your Section 1 exam
• The table should be able to accommodate everything that the you are going
to measure and record during the investigation.
• The table should include appropriate headings and units.
Independent
variable
(units)
Marks
Guidance
0
No table or a table with
incomplete headings or units
for the measured variables.
Fewer than half of the
required elements are
present.
1
A table with incomplete
headings or units for the
measured variables.
At least half of the required
elements should be present.
2
Correct headings and units
present for all measured
variables.
Dependent variable (units)
Test 1
Test 2
Test 3
Mean
You may need to include
additional information (e.g.
start temp, end temp and
change in temp).
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
4
• ISA section 1 exam – Additional / Separate Science
All these tables scored full marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
5
• Practical
Carrying out the practical:
• You can use the method and results table you came up with in Section 1 but it is likely that you will be
provided with a method to follow and results table to fill in so class results can be collected.
• There is no specified time limit for the practical work, although it is anticipated that most experiments should
be capable of being completed within a one hour lesson.
• If necessary however, the experiment may be continued over a number of lessons. Any paperwork, e.g. result
tables, will be collected in at the end of the first lesson, and returned to the you at the start of the next lesson.
• All results will be pooled together in the second lesson so everyone has a class set of results.
Categoric data:
• Categoric values have values that are
labels. E.g. names of plants or types
of material.
• You would normally use a bar chart
to represent this data.
Continuous data:
• Continuous values can have values (called a quantity) that can
be given a magnitude either by counting (as in the case of
number of shrimp) or by the measurement (e.g. light intensity,
flow rate etc.)
• You would normally use a line graph to represent this data.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
6
• Complete practical and draw a graph of your results
Producing a graph or bar chart:
• You will be required to draw a graph or bar chart of
your results
Marks
Answer
Additional guidance
1
X axis: suitable
scales chosen and
labelled with
quantity and units.
Scale should be such that the plots
occupy at least one third of each axis.
Accept axes reversed.
1
Y axis: suitable
scales chosen and
labelled with
quantity and units.
It may not always be necessary to show
the origin.
1
Points or bars
plotted correctly to
within ± 1 mm.
Allow one plotting error out of each 5
points/bars plotted.
Suitable line
drawn on graph or
bars correctly
labelled on bar
chart.
Allow error carried forward from
incorrect points.
If wrong type of graph / chart, maximum
3 marks.
If the independent variable is:
• categoric, a bar chart should be drawn
• continuous, a best fit line should be
drawn
N.B. If no line is possible because there
is no correlation, candidates should
state this on the graph to gain the mark
Dependent variable (units)
Title:
• This should describe what your graph shows
Line of best fit:
• This goes roughly through the middle of all the
scatter points on a graph. The closer the points are
to the line of best fit the stronger we can say the
correlation is.
• It can be a curve.
Anomalous results:
• Put a ring round any outliers to show you know they
do not if the pattern.
Jagged line:
• These indicate a broken scale. A broken scale is
used when values close to 0 are not required.
Independent variable (units)
1
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
6
• Complete practical and draw a graph of your results
All these graphs scored full marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Section 2 Exam:
• Up to 50 minutes is allowed for this.
• The test may be taken in the normal teaching room,
provided that you can be accommodated in such a
way as to prevent any copying or unauthorised
collaboration. However the test will usually take
place in the hall, dance studio or drama studio
depending on their availability.
• If you normally have a reader, extra time, scribe etc.
for exams then you will have the same
arrangements made for the ISA exam.
• Section 1 of the ISA will contain questions
concerning conclusions and evaluation and is worth
30 marks of the overall 50 allocated to the
Controlled Assessment.
• You may use your Candidate Research notes sheet,
which you filled in during your research.
• You will also be given a data sheet with 4 case
studies.
Section 2 Exam:
There are normally 4 questions, some of these questions
are made up of more than one part:
1.Analyse and evaluate your results
a) What were the variables in the investigation you
did?
b) - e) These questions are on a variety of topics
and may vary in number from ISA to ISA
2.Analyse and evaluate the data given in the case studies
a) Sketch graph
b) Explain whether or not the results on the
Secondary data sheet support the given
hypothesis
c) Analysis of Case Study 4
This is only a guide there may be more questions based on
the case studies
3.How could the results from your investigation be useful in
the context that you have researched?
3 marks
4.Submit the graph or bar chart you have drawn of your
results
4 marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Variables:
• These are physical, chemical or biological quantities
or characteristics
You may be asked a question similar to this in the
section 2 exam:
• What were the variables in the investigation that you
did?
• The independent variable was
• The dependent variable was
• One control variable was
3 marks
State, give, name, write down:
• Only a short answer is required, not an explanation
or a description. Often it can be answered with a
single word, phrase or sentence.
• If the question asks the you to state, give, or write
down one (or two etc) examples, they should write
down only the specified number of answers, or they
may lose marks for any wrong examples given.
Marks
Guidance
0
No credit worthy response
1
Any one variable correctly identified
2
Any two variables correctly identified
3
Any three variables correctly identified
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of
a good answer
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Resolution:
• This is the smallest change in quantity
being measured (input) of a
measuring instrument that gives a
perceptible change in the reading.
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
You may be asked a question similar to this in the
section 2 exam:
• Think about the way in which you took your
measurements.
• Resolution means the smallest scale division on the
measuring instrument that you were using.
• What was the resolution of your measurement
for…
• Do you think that this resolution was appropriate for
this investigation?
• Explain your answer
3 marks
Marks
Guidance
0
No credit worthy response
1
A correct value for the resolution is given
OR
A sensible but incorrect value is given for the resolution, with a
correct statement appropriate to the resolution they have given.
2
A correct value for the resolution is given
OR
A correct statement as to whether or not the resolution was
appropriate is given, but the explanation is not clear
3
A correct value for the resolution is given
OR
A correct statement as to whether or not the resolution was
appropriate is given with a clear explanation
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Repeatable:
• A measurement is repeatable if the
original experimenter repeats the
investigation using the same method
and obtains the same results.
You may be asked a question similar
to this in the section 2 exam:
• Look at your results.
• Did you repeat any of the results in
your investigation?
• Explain why you did or did not repeat
any of your results.
• You explanation should include
examples from your results.
3 marks
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
There is a correct statement regarding whether or not any measurements
were repeated
There is mention of the presence or absence or anomalous results
2
There is a correct statement regarding whether or not any measurements
were repeated
There is reference to either anomalous results or to systematic or random
uncertainties
3
There is a correct statement regarding whether or not any measurements
were repeated and a clear indication of which results were repeated
There is reference to either anomalous results or to systematic or random
uncertainties, and the effects that these would cause
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Range:
• The maximum and minimum values of
the independent or dependent variables;
important in ensuring that any pattern is
detected.
You may be asked a question similar
to this in the section 2 exam:
• In your investigation you changed the
concentration / mass of X.
• What was the range of this variable?
Give the units.
• The range was from ……… to ………
• If you had been able to use another
value of this variable, either within or
outside this range what value would you
have chosen?
• Give a reason for your answer
3 marks
Explain:
• You should make something clear, or state the reasons for something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
At least one end of the range is correctly stated.
Another value of the independent variable is suggested, although it
may not be appropriate.
2
The range is correctly stated, according to the candidate’s own results.
Another appropriate value of the independent variable is suggested.
The reason for the additional value is unclear or inappropriate.
3
The range is correctly stated, according to the candidate’s own results.
Another appropriate value of the independent variable is suggested.
The reason for the additional value is clear and appropriate.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Hypothesis:
• A proposal intended to
explain certain facts or
observations
You may be asked a
question similar to this in
the section 2 exam:
• The hypothesis that you
were given before you
started the investigation was
…
• Do your results support this
hypothesis?
• Explain your answer.
3 marks
Explain:
• You should make something clear, or state the reasons for something
happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A simple correct statement is made as to whether or not the results support
the hypothesis with an attempt at an explanation
2
A simple correct statement is made as to whether or not the results support
the hypothesis and an explanation that includes a simple description of a
correctly identified pattern or lack of pattern
3
A simple correct statement is made as to whether or not the results support
the hypothesis and an explanation that includes a detailed description of a
correctly identified pattern or lack of pattern.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of a
good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Reproducible:
• A measurement is reproducible if the
investigation is repeated by another
person, or by using equipment or
techniques, and the same results are
obtained.
You may be asked a question similar
to this in the section 2 exam:
• You have been given a set of results
obtained by other people.
• Do these results other results show
that this investigation is reproducible?
• Explain your answer using examples
from the results.
3 marks
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A simple statement is made as to whether or not the pattern of the
other results is similar to the candidate’s results
2
A simple statement is made as to whether or not the pattern of the
other results is similar to the candidate’s results and an
explanation is provided using either an example from the other
results or a correctly identified pattern
3
A simple statement is made as to whether or not the pattern of the
other results is similar to the candidate’s results and a detailed
explanation is provided using either; two examples from the other
results or a correctly identified and described pattern in the results
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of
a good answer
An example of
a poor answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Repeatable:
• A measurement is repeatable if the
original experimenter repeats the
investigation using the same method
and obtains the same results.
You may be asked a question similar
to this in the section 2 exam:
• If you were to repeat your experiment,
would you make any changed to your
method?
• Explain why you would or would not
make any changes, using examples
from your results.
3 marks
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
Simple appropriate suggestion given as to why changes would be
made
2
Simple appropriate suggestion given as to why changes would be
made together with examples quoted from the results
3
Simple appropriate suggestion given as to why changes would be
made together with examples quoted from the results plus an
explanation of why these changes would improve the results
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of a
good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Sketch graph:
• A line graph, not necessarily on a grid, that shows
the general shape of the relationship between two
variables. It will not have any points plotted and
although the axes should be labelled they may not
be scaled.
Explain:
• You should make something clear, or state the
reasons for something happening.
• The points in the answer must be linked coherently
and logically.
• The answer should not be a simple list of reasons.
You may be asked a question similar to this in the
section 2 exam:
• You have been given a Secondary Data Sheet that
provides results from similar investigations.
• Draw a sketch graph of the results in Case Study 1.
3 marks
Marks
Guidance
0
No credit worthy response
1
Both axes labelled with the variables and units
2
Both axes labelled with the variables and units and
an appropriate line drawn
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of
a good answer
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Data:
• Information, either qualitative or
quantitative, that has been collected.
You may also be asked a question
similar to this in the section 2 exam
• Explain whether or not the results on
the Secondary Data Sheet support the
hypothesis you were given.
• To gain full marks your explanation
should include appropriate examples
from the results in Case studies 1, 2
and 3.
3 marks
You may also be asked a similar
question on a Additional Science or
Separate Science ISA
Explain
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A clear statement is made that Case study 1 supports the
hypothesis and a simple correct statement is made about one of
the other case studies
2
A clear statement is made that Case study 1 supports the
hypothesis and correct statements are made about both Case
studies 2 and 3 supported by a more detailed explanation of one
of them.
3
A clear statement is made that Case study 1 supports the
hypothesis and correct statements are made about both Case
studies 2 and 3 supported by a more detailed explanation of both
of them.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Relationship:
• When one variable has an effect on
another variable
You may also be asked a question
similar to this in the section 2 exam
• Use Case Study 4 to answer the
question.
• What is the relationship between X
and Y?
• Explain how well the information in
Case Study 4 supports your answer.
3 marks
The content of the question and mark
scheme will vary depending on the ISA.
Explain;
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
There is a statement that the higher the specific heat capacity the
smaller the temperature rise produced in the substance
2
There is a statement that the higher the specific heat capacity the
smaller the temperature rise produced in the substance and some data
is quoted to support this
3
There is a statement that the higher the specific heat capacity the
smaller the temperature rise produced in the substance and some data
is quoted to support this
There is a realisation that any discerned relationship can only be an
approximation using the data in the table, as the data contains some
anomalies
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Valid conclusion:
• A conclusion supported by valid
data, obtained from an appropriate
experimental design and based on
sound reasoning.
You may also be asked a
question similar to this in the
section 2 exam
• Look at Case Study 4.
• A X who saw the results advised
…
• Do you agree with this advice?
• Explain your answer.
3 marks
The context of the question and
mark scheme will vary depending
on the ISA.
Explain;
• You should make something clear, or state the reasons for something
happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A comment is made as to whether the advice is supported or not
There is a simple statement that uses information from the graph to support the
comment
2
A comment is made as to whether the advice is supported or not
There is a statement that uses information from the graph to support the comment
A clear advantage of using “Ger-off” or a clear disadvantage of using “Ger-off” is
stated
3
A comment is made as to whether the advice is supported or not
There is a statement that uses information
from the graph to support the comment
A clear advantage of using “Ger-off” and a clear disadvantage of using “Ger-off” is
stated
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of a
good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Hypothesis:
• A proposal intended to
explain certain facts or
observations
You may be asked a
question similar to this
in the section 2 exam:
• Look at Case Study 4.
• To what extent do the
results support the
hypothesis you were
given?
3 marks
The context of the mark
scheme will vary
depending on the ISA.
Explain:
• You should make something clear, or state the reasons for something
happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
Increasing the mass of aggregate increases the force needed to break the beam initially, but the
strength then declines as more aggregate is added.
2
Increasing the mass of aggregate increases the force needed to break the beam initially, but the
strength then declines as more aggregate is added.
The maximum strength of the beam is quoted.
OR
A comment is made regarding the difference in gradient of the graph before and after the peak.
3
Increasing the mass of aggregate increases the force needed to break the beam initially, but the
strength then declines as more aggregate is added.
The maximum strength of the beam is quoted.
AND
A comment is made regarding the difference in gradient of the graph before and after the peak.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Context:
• Your teacher will describe the context in which the investigation is set.
Relating the investigation to the context
• Your teacher will describe the context in which the investigation is set.
• You must research this context and write down how the results of your investigation might be useful, e.g. health
and safety developments, energy efficiency, in industry, etc.
You may be asked a question similar to this in the
section 2 exam:
• How could the results from your investigation be
useful in the context that you have researched?
• You may use information from your Candidate
Research Notes to help you to answer this question.
3 marks
Marks
Guidance
0
No credit worthy response
1
An idea from the research has been related to the
context
2
An idea from the research has been related to the
context and there is a simple explanation of how the
idea can be applied and used in the given context
3
An idea from the research has been related to the
context and there is a detailed explanation of how
this idea can be applied in the given context
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
An example of a poor
answer
An example of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Producing a graph or bar chart:
• You will be required to draw a graph or bar chart of
your results
Marks
Answer
Additional guidance
1
X axis: suitable
scales chosen and
labelled with
quantity and units.
Scale should be such that the plots
occupy at least one third of each axis.
Accept axes reversed.
1
Y axis: suitable
scales chosen and
labelled with
quantity and units.
It may not always be necessary to show
the origin.
1
Points or bars
plotted correctly to
within ± 1 mm.
Allow one plotting error out of each 5
points/bars plotted.
Suitable line
drawn on graph or
bars correctly
labelled on bar
chart.
Allow error carried forward from
incorrect points.
If wrong type of graph / chart, maximum
3 marks.
If the independent variable is:
• categoric, a bar chart should be drawn
• continuous, a best fit line should be
drawn
N.B. If no line is possible because there
is no correlation, candidates should
state this on the graph to gain the mark
Dependent variable (units)
Title:
• This should describe what your graph shows
Line of best fit:
• This goes roughly through the middle of all the
scatter points on a graph. The closer the points are
to the line of best fit the stronger we can say the
correlation is.
• It can be a curve.
Anomalous results:
• Put a ring round any outliers to show you know they
do not if the pattern.
Jagged line:
• These indicate a broken scale. A broken scale is
used when values close to 0 are not required.
Independent variable (units)
1
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
All these graphs scored full marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Section 2 Exam:
• Up to 50 minutes is allowed for this.
• The test may be taken in the normal teaching room,
provided that you can be accommodated in such a
way as to prevent any copying or unauthorised
collaboration. However the test will usually take
place in the hall, dance studio or drama studio
depending on their availability.
• If you normally have a reader, extra time, scribe etc.
for exams then you will have the same
arrangements made for the ISA exam.
• Section 1 of the ISA will contain questions
concerning conclusions and evaluation and is worth
30 marks of the overall 50 allocated to the
Controlled Assessment.
• You may use your Candidate Research notes sheet,
which you filled in during your research.
• You will also be given a data sheet with 4 case
studies.
Section 2 Exam:
There are normally 4 questions, some of these questions
are made up of more than one part:
1.Analyse and evaluate your results
a) Do your results support your hypothesis?
b) - e) These questions are on a variety of topics
and may vary in number from ISA to ISA
2.Analyse and evaluate the data given in the case studies
a) Sketch graph
b) Explain whether or not the results on the
Secondary data sheet support the given
hypothesis
c) Analysis of Case Study 4
This is only a guide there may be more questions based on
the case studies
3.How could the results from your investigation be useful in
the context that you have researched?
3 marks
4.Submit the graph or bar chart you have drawn of your
results
4 marks
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Hypothesis:
• A proposal intended to explain
certain facts or observations
You may also be asked a
question similar to this in the
section 2 exam
• Do your results support the
hypothesis that you
investigated?
• You should use any pattern
that you can see in you
results to support your
answer.
• You should include examples
from your results
3 marks
Explain:
• You should make something clear, or state the reasons for something
happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A simple correct statement is made as to whether or not the results
support the hypothesis with an attempt at an explanation
2
A simple correct statement is made as to whether or not the results
support the hypothesis and an explanation that includes a simple
description of a correctly identified pattern or lack of pattern
3
A simple correct statement is made as to whether or not the results
support the hypothesis and an explanation that includes a detailed
description of a correctly identified pattern or lack of pattern.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Anomalous:
• A result that does not fit
into a common, familiar, or
expected type or pattern
You may be asked a
question similar to this in
the section 2 exam:
• Did you get any
anomalous results?
• Explain your answer.
• Your explanation should
include examples from
your results.
3 marks
Explain:
• You should make something clear, or state the reasons for something
happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
There is a correct statement as to whether or not there are any anomalous results
2
There is a correct statement as to whether or not there are any anomalous results
and a statement or implication that anomalous results are ones that do not fit the
pattern.
3
There is a correct statement as to whether or not there are any anomalous results
and a statement or implication that anomalous results are ones that do not fit the
pattern.
Some examples from the results are given to support this, eg by specifying results
that are considered to be anomalous or by referring to the fact that, eg all results are
very close to a line of best fit.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Reproducible:
• A measurement is reproducible if the
investigation is repeated by another
person, or by using equipment or
techniques, and the same results are
obtained.
You may be asked a question similar
to this in the section 2 exam:
• Reproducibility is important in
experiments.
• Do you think that your results are
reproducible by other people?
• Use examples from your results to
explain the reason for your answer.
3 marks
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A statement is made as to whether or not the results are likely to
be reproducible, with a reason stated.
2
A statement is made as to whether or not the results are likely to
be reproducible, with a reason stated and an explanation is given.
3
A statement is made as to whether or not the results are likely to
be reproducible, with a reason stated and an explanation is given.
There is a detailed explanation supported by at least one example
from the results .
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Repeatable:
• A measurement is repeatable if the
original experimenter repeats the
investigation using the same method
and obtains the same results.
Accuracy:
• A measurement result is considered
accurate if it is judged to be close to
the true value.
You may be asked a question similar
to this in the section 2 exam:
• Describe in detail how you could use
repeated readings to obtain more
accurate results.
3 marks
Explain:
• You should recall some facts, events or process in an accurate
way - for example an experiment you have done.
• You may need to give an account of what something looked like,
or what happened, eg a trend in some data.
Marks
Guidance
0
No credit worthy response
1
A statement is made that a mean should be calculated.
2
A statement is made that a mean should be calculated by adding
the results together and dividing by the number of values.
3
A statement is made that a mean should be calculated, by adding
the results together and dividing by the number of values.
A statement is made that either anomalous results are discarded
before calculating a mean or a graph is plotted and a best fit line
is drawn ignoring anomalous points
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Range:
• The maximum and minimum values of
the independent or dependent
variables; important in ensuring that
any pattern is detected.
You may be asked a question similar
to this in the section 2 exam:
What was the independent variable in
the investigation that you did?
What was the range of the independent
variable?
The range was from ……… to ………
Explain why this was or was not a
suitable range.
3 marks
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
At least one end of the range is correctly stated
Another value of the independent variable is suggested, although it may
not be appropriate
2
The range is correctly stated, according to the candidate’s own results
Another appropriate value of the independent variable is suggested
The reason for the additional value is unclear or inappropriate
3
The range is correctly stated, according to the candidate’s own results
Another appropriate value of the independent variable is suggested
The reason for the additional value is clear and appropriate
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a poor
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Resolution:
• This is the smallest change in quantity
being measured (input) of a
measuring instrument that gives a
perceptible change in the reading.
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
You may be asked a question similar to this in the
section 2 exam:
• Resolution refers to the smallest scale division of a
measuring instrument.
• What was the resolution of the device that you used
to measure the timing of the reaction?
• Do you think that this resolution was appropriate for
this measurement?
• Explain your answer.
3 marks
Marks
Guidance
0
No credit worthy response
1
A correct value for the resolution is given
OR
A sensible but incorrect value is given for the resolution, with a
correct statement appropriate to the resolution they have given.
2
A correct value for the resolution is given
AND
A correct statement as to whether or not the resolution was
appropriate is given, but the explanation is not clear
3
A correct value for the resolution is given
AND
A correct statement as to whether or not the resolution was
appropriate is given with a clear explanation
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Uncertainty:
• The interval within which the true
value can be expected to lie, within a
given level of confidence or
probability.
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
You may be asked a question similar to
this in the section 2 exam:
Most investigations contain errors or
uncertainties.
What do you think was the cause of the
largest error or uncertainty in your
investigation?
What you could do to reduce the size of this
error if you were to repeat the investigation?
Explain your answer.
3 marks
Marks
Guidance
0
No credit worthy response
1
There is a statement as to the possible cause of the largest error.
2
There is a statement as to the possible cause of the largest error.
An appropriate suggestion is made regarding how the size of this
error might be reduced.
3
There is a statement as to the possible cause of the largest error.
An appropriate suggestion is made regarding how the size of this
error might be reduced. together with an explanation regarding
how the suggestion might lead to a reduction in the size of the
error.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Sketch graph:
• A line graph, not necessarily on a grid, that shows
the general shape of the relationship between two
variables. It will not have any points plotted and
although the axes should be labelled they may not
be scaled.
Explain:
• You should make something clear, or state the
reasons for something happening.
• The points in the answer must be linked coherently
and logically.
• The answer should not be a simple list of reasons.
You may be asked a question similar to this in the
section 2 exam:
• You have been given a Secondary Data Sheet that
provides results from similar investigations.
• Draw a sketch graph of the results in Case Study 1.
3 marks
Marks
Guidance
0
No credit worthy response
1
Both axes labelled with the variables and units
2
Both axes labelled with the variables and units and
an appropriate line drawn
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An example of
a good answer
An example of
a good answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Hypothesis:
• A proposal intended to explain certain
facts or observations
You may also be asked a question
similar to this in the section 2 exam
• X investigates the following hypothesis
…
• Explain whether or not the results in
Case Studies 1, 2 and 3 support this
hypothesis.
• To gain full marks your explanation
should include appropriate examples
from the results in Case studies 1, 2
and 3.
3 marks
Explain:
• You should make something clear, or state the reasons for
something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
A simple correct statement is made about at least two of the
Case Studies 1, 2 and 3, as to whether or not they support the
hypothesis.
2
Correct statements are made Case Studies 1, 2 and 3, supported
by a more detailed explanation of one of them.
3
Correct statements are made Case Studies 1, 2 and 3, supported
by a more detailed explanation of both Case Studies 2 and 3.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Science A
Hypothesis:
• A proposal intended
to explain certain
facts or observations
You may be asked a
question similar to
this in the section 2
exam:
• Look at Case Study
4.
• To what extent do the
results shown support
the manufacturer's
hypothesis?
• Explain your answer.
3 marks
Explain:
• You should make something clear, or state the reasons for something happening.
• The points in the answer must be linked coherently and logically.
• The answer should not be a simple list of reasons.
Marks
Guidance
0
No credit worthy response
1
There is a simple statement saying whether or not the results in Case study 4
support the manufacturer's hypothesis and this is supported by some qualitative
information quoted.
2
There is a simple statement saying whether or not the results in Case study 4
support the manufacturer's hypothesis and this is supported by some
quantitative information quoted.
3
There is a simple statement saying whether or not the results in Case study 4
support the manufacturer's hypothesis and this is supported by some
quantitative information quoted.
There is also a statement that makes clear the limitations of the data in
supporting the hypothesis.
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An
example
of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Context:
• Your teacher will describe the context in which the investigation is set.
Relating the investigation to the context
• Your teacher will describe the context in which the investigation is set.
• You must research this context and write down how the results of your investigation might be useful, e.g. health
and safety developments, energy efficiency, in industry, etc.
You may be asked a question similar to this in the
section 2 exam:
• How could the results from your investigation be
useful in the context that you have researched?
• You may use information from your Candidate
Research Notes to help you to answer this question.
3 marks
Marks
Guidance
0
No credit worthy response
1
An idea from the research has been related to the
context
2
An idea from the research has been related to the
context and there is a simple explanation of how the
idea can be applied and used in the given context
3
An idea from the research has been related to the
context and there is a detailed explanation of how
this idea can be applied in the given context
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
An example of a poor
answer
An example of a good
answer
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
Producing a graph or bar chart:
• You will be required to draw a graph or bar chart of
your results
Marks
Answer
Additional guidance
1
X axis: suitable
scales chosen and
labelled with
quantity and units.
Scale should be such that the plots
occupy at least one third of each axis.
Accept axes reversed.
1
Y axis: suitable
scales chosen and
labelled with
quantity and units.
It may not always be necessary to show
the origin.
1
Points or bars
plotted correctly to
within ± 1 mm.
Allow one plotting error out of each 5
points/bars plotted.
Suitable line
drawn on graph or
bars correctly
labelled on bar
chart.
Allow error carried forward from
incorrect points.
If wrong type of graph / chart, maximum
3 marks.
If the independent variable is:
• categoric, a bar chart should be drawn
• continuous, a best fit line should be
drawn
N.B. If no line is possible because there
is no correlation, candidates should
state this on the graph to gain the mark
Dependent variable (units)
Title:
• This should describe what your graph shows
Line of best fit:
• This goes roughly through the middle of all the
scatter points on a graph. The closer the points are
to the line of best fit the stronger we can say the
correlation is.
• It can be a curve.
Anomalous results:
• Put a ring round any outliers to show you know they
do not if the pattern.
Jagged line:
• These indicate a broken scale. A broken scale is
used when values close to 0 are not required.
Independent variable (units)
1
Controlled Assessment Unit - CAU
Investigative Skills Assessment - ISA
7
• ISA section 2 exam – Additional / Separate Science
All these graphs scored full marks