系统分析与设计课件sad04.Modeling System Requirements with Use Cases.pptx

Modeling System Requirements with Use Cases
Chapter 4
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College of Software, BUAA
Contents
1. Use Case Modeling
2. The Process of Use-Case Modeling
3. Use Cases and Project Management
2
System Analysis & Design Copyright © ******@buaa.edu.cn
College of Software, BUAA
Contents
1. Use Case Modeling
2. The Process of Use-Case Modeling
3. Use Cases and Project Management
3
System Analysis & Design
Copyright © ******@buaa.edu.cn
College of Software, BUAA
-4-
Challenge
One of the primary challenges is the ability to
elicit the correct and necessary system requirements from the stakeholders and specify them in a manner understandable to them so those requirements can be verified and validated.
System Analysis & Design
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College of Software, BUAA
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Challenge (cont.)
The hardest single part of building a software system is deciding precisely what to build. No other part of the conceptual work is a difficult as establishing the detailed technical requirements, including all the interfaces to people, to machines, and to other software systems. No other work so cripples the resulting system if done wrong. No other part is more difficult to rectify later. Fred Brooks
System Analysis & Design
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College of Software, BUAA
-6-
IS Development Project Track Record
canceled before completion
Over budget, late, or without needed features
System Analysis & Design
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College of Software, BUAA
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User-Centered Development and Use-Case Modeling
User-centered development
a process of systems development based on understanding the needs of the stakeholders and the reasons why the system should be developed.
Use-case modeling
the process of modeling a system’s functions in terms of business events, who initiated the events, and how the system responds to those events.