Systems Analysis and Design
5th Edition
Mid-term Solution
Li Jing, Rachael
lijing@se.cuhk.edu.hk
© Copyright 2011 John Wiley & Sons, Inc.
Question 1
 What calculations are used in economic
feasibility?
– Return on investment(ROI) 3’
– Break-even Point(BEP) 3’
– Net present value of money(NPV)/Present
Value(PV) 3’
– Other calculation method 1’
 ROI+BEP+NPV(PV)=10’
© Copyright 2011 John Wiley & Sons, Inc.
Question 2
 What are the four phases of the SDLC and what is the
major deliverable from each of the phases?
– Planning 1’ - system request/feasibility
study/project plan 1.5’
– Analysis 1’ - system proposal/requirements + use
case 1.5’
– Design 1’ – (system/program/database)
specification/Alternative Matrix 1.5’
– Implementation 1’ – (installed) system /
documentation + migration plan + support plan 1.5’
© Copyright 2011 John Wiley & Sons, Inc.
Question 3
 What is ROI?(4’)
– Return on Investment (4’)
– Or Formula (4’)
– To evaluate a project’s worth(2’)
 Total benefits:$182,000 and total cumulative
costs:$120,000. What would be the ROI?(6’)
– (182000-120000)/120000=0.5167 6’
– Formula given in (a) or (b) 4’
– Calculation result 2’
© Copyright 2011 John Wiley & Sons, Inc.
Question 4
What is the difference between
systems prototyping and throwaway
prototyping methodologies?
– a functional system 5’
– understanding the user requirements and
design considerations more quickly 5’
© Copyright 2011 John Wiley & Sons, Inc.
System Prototyping
Evolve into
final system 1’
 Quick 2’
 Dirty 2’
Thorough
analysis
2’
Throwaway
Prototyping
2’
Throwaway
© Copyright 2011 John Wiley & Sons, Inc.
/refine 1’
Question 4
Throwaway prototyping
– With unfamiliar technology 2’
– Complex system 2’
– Reliable system 2’
System prototyping
– Short time schedule 2’
– Schedule visibility 2’
© Copyright 2011 John Wiley & Sons, Inc.
Question 5
 What are the main differences between the
Waterfall Development and the Rapid
Application Development methodologies?
 RAD emerge in response to the weakness of
waterfall
–
–
–
–
With unclear user requirement 2.5’
With unfamiliar technology 2.5’
With short time schedule 2.5’
With schedule visibility 2.5’
© Copyright 2011 John Wiley & Sons, Inc.
Question 6
 Explain functional and non-functional requirements and
give 2 examples in each case for a bank ATM system.
 Functional requirements
– what the software should do 2’/ processes 1’ + information 1’
– Example 1: allow users to check their balance
– Example 2: include real-time balance
 Non-functional requirements
– characteristics the system should have 4’/ operational 1’ +
performance 1’ + security 1’ + cultural and political
requirements 1’
– Example 1: finish any user operation in 10 seconds
– Example 2:include all possible safeguards from viruses
© Copyright 2011 John Wiley & Sons, Inc.
Question 7
 What are the steps for writing a use case?
–
–
–
–
Identify the (major) use cases. 2.5’
Identify the major steps for (within) each use cases. 2.5’
Identify elements within steps 2.5’
Confirm the use case 2.5’
 Activities of each steps given is also OK.
© Copyright 2011 John Wiley & Sons, Inc.
Question 8
 What are external and temporal event triggers? Give
an example each for a bank ATM system.
 External events
– occur outside the system, usually triggered by someone who
interacts with the system. 3’
– Example: event trigged by users when they withdraw some
money from an ATM 2’
 Temporal events
– occur at a defined point in time, such as the end of a workday or
the end of every month. 3’
– Example: a user logs into the ATM system and does nothing for
a long time, the ATM will expire current session
© Copyright 2011 John Wiley & Sons, Inc.
Question 9
What are the characteristics of (a) a
project and (b) process?
Project(also called temporary effort)
– Clear start and end dates/finite period of time 2.5’
– Clear deliverables (product, service or result) 2.5’
Process
– Multiple stages/series of steps 2.5’
– Lead to a product/activity/resource/output 2.5’
© Copyright 2011 John Wiley & Sons, Inc.
Question 10
SDLC is a time and quality trade-off.
Why?
The Systems Development Life Cycle
Time ↑ and quality ↑
All reasonable answer is OK.
© Copyright 2011 John Wiley & Sons, Inc.
Thank you!
lijing@se.cuhk.edu.hk
© Copyright 2011 John Wiley & Sons, Inc.
Copyright 2011 John Wiley & Sons, Inc.
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© Copyright 2011 John Wiley & Sons, Inc.