Transcript Document

for the Small Enterprise
Systems Analysis and Design
chapter6
section II
Analysis
the user’s system diagram
the menu tree
the system flowchart
new system design – a first look
the cornucopia case
portfolio project
Chapter Objectives
When you complete this chapter you will be able to:
• Create a user-friendly model of how the system
works
• Create a user-friendly model of functions and
services the system provides
• Create a system flowchart
• Develop several elementary project management
tools
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The User’s System Diagram
• The user’s system diagram (USD) is an
image-based, iconographic version of the
DFD
• The USD facilitates communication between
the user and analyst
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System Models and the Six CIS Components
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TECHNOTE 6-1
The Information System End User
•The information system end user
has become more sophisticated
•Modern information systems must
blend user’s desktop functionality
with enterprise-wide in formation
systems
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TKSystem USD
Issue Cards
Set Up
Login/Logout
Back Up
Adjust Hours
Reports
Replace Cards
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TKSystem USD and DFD Comparison
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The Menu Tree
A menu tree is a hierarchical display
of the operational choices available to
the user
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Figure 6-4:TKSystem Menu tree
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TKSystem USD and Menu Tree Comparison
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The System Flowchart
A system flowchart shows:
– the relationships between software and
data inputs and outputs
– the real-world devices used to implement
the system
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TKSystem Flowchart with Symbols
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Figure 6-6: TKSystem Flowchart (Revised)
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New System Design – A First Look
• Even though the analyst has not yet
engaged in formal design activities, it is
natural for the analyst to to consider
potential design innovations or
modifications while investigating and
charting the existing system
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Figure 6-7: The Enhanced SDLC (Reprise)
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TECHNOTE 6-2
Model-Building Software
While CASE tools, such as Visible
Analyst, offer sophisticated
modeling environments, there are
other model-building products on
the market:
–Microsoft Visio
–Rational Rose
–Oracle Designer
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The Cornucopia Case
The formal analysis of the current system
concludes with the development of system
models. At this point in the process the
analysts have a good understanding of the
old system and, perhaps surprisingly, a
rough idea of what the new system will
include.
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Cornucopia Existing System USD
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Cornucopia Project Management
Cost Breakdown
Hour Breakdown
Analyst Hours Log
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Cornucopia Project Budget
$4300 estimated total labor cost
(86 hours * $50 per hour)
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Cornucopia Project Status
86 estimated total hours
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Cornucopia PERT Worksheet
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Cornucopia PERT Chart
Tasks 4,5
Task 3
Tasks 1,2
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Tasks 7,8
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Cornucopia Project Dictionary Structure
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Chapter Summary (1/2)
• This chapter completes the modeling process
• The models provide two views of the system
– The technical view of the computer professional
– The friendly view of the user
• The system flowchart is a technical model
showing the relationships between files,
programs, and subsystems
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Chapter Summary (2/2)
• The menu tree shows the functions of the
system
• The user’s system diagram uses a picturebased, storytelling technique to help the user
understand how the subsystems interface with
one another
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