上海交通大学：《面向对象分析与设计 Object Oriented Analysis and Design》课程教学资源（PPT课件讲稿）08 Requirements Overview

Shanghai Jiao Tong University 上海交通大学 Object Oriented Analysis and Design Requirements Overview 上海交通大学软件工程中心

Shanghai Jiao Tong University 上海交通大学软件工程中心 Object Oriented Analysis and Design Requirements Overview

Outline 女◆Introduction ◆Key Concepts ◆Use-Case Model ◆Glossary Supplementary Specifications Object Oriented Analysis and Design 2

Object Oriented Analysis and Design 2 Outline  Introduction  Key Concepts  Use-Case Model  Glossary  Supplementary Specifications

Requirements in Context Phases The purpose of Requirements is to: Disciplines Inception Elaboration Construction Transition Establish and maintain agreement Business Modeling Requirements with the customers and other Analysis Design stakeholders on what the system should do. Implementation Test Deployment Give system developers a better Configuration understanding of the requirements Change Mgmt Project Management of the system. Environment Elab #1 Delimit the system. Initial 日ab*2 #12 Iterations Provide a basis for planning the technical contents of the iterations. Provide a basis for estimating cost and time to develop the system. ● Define a user interface of the system. Object Oriented Analysis and Design 3

Object Oriented Analysis and Design 3 Requirements in Context The purpose of Requirements is to: • Establish and maintain agreement with the customers and other stakeholders on what the system should do. • Give system developers a better understanding of the requirements of the system. • Delimit the system. • Provide a basis for planning the technical contents of the iterations. • Provide a basis for estimating cost and time to develop the system. • Define a user interface of the system

Relevant Requirements Artifacts Use-Case Model Glossary Actors Use Cases Supplementary Specification Use-Case Specifications Object Oriented Analysis and Design

Object Oriented Analysis and Design 4 Relevant Requirements Artifacts Supplementary Specification Glossary Use-Case Specifications ... Use-Case Model Actors Use Cases

Case Study:Course Registration Problem Statement Review the problem statement provided in the Course Registration Requirements Document. Course Registration Requirements Document Object Oriented Analysis and Design 5

Object Oriented Analysis and Design 5 Case Study: Course Registration Problem Statement  Review the problem statement provided in the Course Registration Requirements Document. Course Registration Requirements Document

Outline ◆Introduction t◆Key Concepts ◆Use-Case Model Glossary ◆ Supplementary Specifications Object Oriented Analysis and Design 6

Object Oriented Analysis and Design 6 Outline  Introduction  Key Concepts  Use-Case Model  Glossary  Supplementary Specifications

What Is System Behavior? ◆ System behavior is how a system acts and reacts. It is the outwardly visible and testable activity of a system. System behavior is captured in use cases. Use cases describe the system,its environment, and the relationship between the system and its environment. Object Oriented Analysis and Design 7

Object Oriented Analysis and Design 7 What Is System Behavior?  System behavior is how a system acts and reacts. ▪ It is the outwardly visible and testable activity of a system.  System behavior is captured in use cases. ▪ Use cases describe the system, its environment, and the relationship between the system and its environment

Major Concepts in Use-Case Modeling An actor represents anything that interacts with the system. Actor A use case is a sequence of actions a system performs that yields an observable result of value to a particular actor. UseCase Object Oriented Analysis and Design 8

Object Oriented Analysis and Design 8 Major Concepts in Use-Case Modeling  An actor represents anything that interacts with the system.  A use case is a sequence of actions a system performs that yields an observable result of value to a particular actor. UseCase Actor

Outline ◆Introduction ◆Key Concepts ★◆Use-Case Model Glossary Supplementary Specifications Object Oriented Analysis and Design 9

Object Oriented Analysis and Design 9 Outline  Introduction  Key Concepts  Use-Case Model  Glossary  Supplementary Specifications

What Is a Use-Case Model? A model that describes a system's functional requirements in terms of use cases A model of the system's intended functionality (use cases)and its environment (actors) View Report Card Register for Courses Student Login Object Oriented Analysis and Design 10

Object Oriented Analysis and Design 10 What Is a Use-Case Model?  A model that describes a system’s functional requirements in terms of use cases  A model of the system’s intended functionality (use cases) and its environment (actors) View Report Card Student Register for Courses Login