BAR CHART
Paweł Bilski
Piotr Mazur
Paulina Wawryca
Definition
Barchart – it is a chart with rectangular bars with lengths
proportional to the values that they represent.
Bar charts are used for comparing two or more values.
The bars can be plotted vertically or horizontally.
Examples
Vertically
Horizontally
Bar charts are familiar to most people, and
interpreting them depends largely on what
information you are looking for.
You might look for:
the tallest bar.
the shortest bar.
growth or shrinking of the bars over time.
one bar relative to another.
change in bars representing the same
category in different
GANTT CHART
Gantt chart
Henry Laurence Gantt devised the Gantt
chart in the 1910.
 A Gantt chart is the most popular type of
bar chart.
 Is a graphical representation of the duration
of tasks against the progression of time.
 A Gantt chart is a useful tool for planning
and scheduling projects.
 It is helpful when monitoring a project’s
progress.

Planning and scheduling
Use a Gantt chart to plan how long a
project should take.
 A Gantt chart lays out the order in which
the tasks need to be carried out.
 Early Gantt charts did not show
dependencies between tasks but modern
Gantt chart software provides this
capability.

Monitoring a Project
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A Gantt chart lets you see immediately what
should have been achieved at any point in
time.
A Gantt chart lets you see how remedial
action may bring the project back on course.
Most Gantt charts include "milestones"
which are technically not available on Gantt
charts. However, for representing deadlines
and other significant events, it is very useful
to include this feature on a Gantt chart.
To create Gantt charts are used:
CS Project Professional
 Easyplane
 Microsoft Project
 Powerproject
 Project Commander

Construction of Gantt chart
Gantt chart is a matrix:
The Gantt chart is constructed with a
horizontal axis representing the total time
span of the project, broken down into
increments (days, weeks, or months) and
with a vertical axis representing the tasks
that make up the project.
 The Gantt chart is constructed with a
graph area which contains horizontal bars
for each task connecting the period start
and period ending symbols.

The Gantt chart has variants:
Milestones: important checkpoints or interim
goals for a project.
 Resources: for team projects, it often helps to
have an additional column containing numbers or
initials which identify who on the team is
responsible for the task.
 Status: the projects progress, the chart is updated
by filling in the task's bar to a length proportional
to the amount of work that has been finished .
 Dependencies: an essential concept that some
activities are dependent on other activities being
completed first.

Advantages of bar charts and linked bar charts
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simple and easy to read
give a good picture on the data
applicable at all stages of the planning process
easily updated (for review purposes and progress reports)
clearly mimics the construction sequence - the use of linking
between bars facilitates the overlapping of related operations
Disadvantages of bar charts and linked bar charts

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Do not show dependency and do not clearly indicate which
operations directly relate to the successful completion of the
project. This makes it difficult to apply management by exception
Logical links are used to overcome this problem but these can
become confusing and difficult to interpret on complex projects
Consequently, complex interrelationships cannot be clearly shown
Sources
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B. Cooke, P. Williams „Construction planning, programming and
control” Third Edition 2009
http://www.skymark.com/resources/tools/bar_charts.asp
http://www.gantt-chart.biz