第四讲 需求分析 嵌入式软件设计开发 教学课件.ppt

嵌入式软件设计开发;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;;;需求分析;需求分析;;需求分析;需求分析;;需求分析;需求分析;需求分析;需求分析;Do UML associations have direction?;需求分析;Roles;Example of Role;Roles in Associations;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;Aggregation;weight;Inheritance;Aggregation vs Inheritance;Other Associations;需求分析;需求分析;需求分析;How do you find classes?;How do you find classes?;Example: Scenario from Problem Statement;Object Modeling in Practice: Class Identification;Object Modeling in Practice: Encourage Brainstorming ;Object Modeling in Practice;Object Modeling in Practice: A Banking System;Object Modeling in Practice: Categorize!;Avoid Ravioli Models;Object Modeling in Practice: Heuristics;Software Engineers are not the only System Analysts;What is a Software Engineer?;Summary;Dynamic Modeling;Dynamic Modeling with UML;Start with Flow of Events from Use Case;What is an Event?;Sequence Diagram;需求分析;需求分析;需求分析;需求分析;需求分析;;需求分析;;需求分析;UML Statechart Diagram Notation;Statechart Diagrams;State;Example of a StateChart Diagram（自动售货机）;Nested（嵌套的） State Diagram;Example of a Nested Statechart Diagram;Expanding activity “do:dispense item”;Superstates;Modeling Concurrency;Example of Concurrency within an Object;State Chart Diagram vs Sequence Diagram;Dynamic Modeling of User Interfaces;Navigation Path Example (15-499 Spring 96);Practical Tips for Dynamic Modeling;Summary: Requirements Analysis;Let’s Do Analysis;Problem Statement: Direction Control for a Toy Car;Find the Functional Model: Do Use Case Modeling;Use Cases continued;Use Case Pruning;Toy Car: Object Model;Find the Dynamic Model: Create sequence diagram;Sequence Diagram for Drive Car Scenario;Toy Car: Dynamic Model;When is a model dominant?;Collaborative Analysis;Analysis: UML Activity Diagram;Object Model Integration in JAMES (Fall 1997);Consistency, Completeness, Ambiguities;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;需求分析;数据流分析 ;数据流图的基本符号 ;附加符号 在数据流图中，如果有两个以上数据流指向一个加工，或是从一个加工中引出两??以上的数据流，这些数据流之间往往存在一定的关系。为表达这些关系，在