the users system diagram

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chapter6
section II Analysis
for the Small Enterprise
Systems Analysis and Design
the users system diagram the menu tree the
system flowchart new system design a first
look the cornucopia case portfolio project
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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 Users System Diagram

• The users 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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Figure 6-1 System Models and the Six CIS
Components
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The Information System End User
TECHNOTE 6-1

• The information system end user has become more
  sophisticated
• Modern information systems must blend users
  desktop functionality with enterprise-wide in
  formation systems

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Figure 6-3 TKSystem USD
Set Up
Issue Cards
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 6-4TKSystem 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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Figure 6-5 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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Open-Minded Discovery
Thinking
Critically

• What level of commitment, legal or otherwise, is
  there to deliver on the early, exploratory ideas
  discussed with the user?

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Model-Building Software
TECHNOTE 6-2

• 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 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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Figure 6-8 CornucopiaExisting System USD
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Cornucopia Project Management
Cost Breakdown
Hour Breakdown
Analyst Hours Log
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Figure 6-10 CornucopiaProject Budget
4300 estimated total labor cost (86 hours 50
per hour)
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Figure 6-12 CornucopiaProject Status
86 estimated total hours
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Figure 6-17 CornucopiaPERT Worksheet
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Figure 6-18 Cornucopia PERT Chart
Tasks 4,5
Task 3
Task 6
Tasks 1,2
Tasks 7,8
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Figure 6-19 CornucopiaProject Dictionary
Structure
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Figure 6-20 Cornucopia Model Analysiswith
Visible Analyst
Enlarge
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Portfolio Project
Portfolio
project

• Team Assignment 6 System Modeling
• Review the project management discussion in
  Appendix A
• Revise the draft project budget and status report
  prepared in Team Assignment 3
• Prepare a USD for the existing system

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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 users system diagram uses a picture-based,
  storytelling technique to help the user
  understand how the subsystems interface with one
  another

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Figure 6-20 Enlargement
Return
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Figure 6-14 Tasks 1,2
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Figure 6-15 Task 3
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Figure 6-15 Tasks 4,5
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Figure 6-16 Task 6
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Figure 6-16 Tasks 7,8
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