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1
Chapter 6
Requirements Modeling: Scenarios, Information, and
Analysis Classes
Software Engineering: A Practitioner’s Approach, 7/e
by Roger S. Pressman
2
Requirements Analysis
Requirements analysis
specifies software’s operational characteristics
indicates software's interface with other system elements
establishes constraints that software must meet
Requirements analysis allows the software engineer (called
an analyst or modeler in this role) to:
elaborate( 精化 ) on basic requirements established during earlier
requirement engineering tasks
build models that depict user scenarios, functional activities,
problem classes and their relationships, system and class
behavior, and the flow of data as it is transformed.
3
A Bridge
system
description
analysis
model
design
model
4
4
Two analysis model
Structured analysis (SA)
Object–oriented analysis (OOA)
功能 ( 用例 )
模型
对象/行为模型
属性、
协作
操作、
对象/关
系模型
5
Elements of Requirements Analysis
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