软件工程第四版第一章.ppt

Contents 1.1 What is Software Engineering? 1.2 How Successful Have We Been? 1.3 What Is Good Software? 1.4 Who Does Software Engineering? 1.5 A Systems Approach 1.6 An Engineering Approach 1.7 Members of the Development Team 1.8 How Has Software Engineering Changed? 1.9 Information System Example 1.10 Real Time Example 1.11 What this Chapter Means for You Objectives What we mean by software engineering Software engineering’s track record What we mean by good software Why a systems approach is important How software engineering has changed since the 1970s. 1.1 What is Software Engineering?Solving Problems Software products are large and complex Development requires analysis and synthesis Analysis: decompose a large problem into smaller, understandable pieces abstraction is the key Synthesis: build (compose) software from smaller building blocks composition is challenging 1.1 What is Software Engineering?Solving Problems (continued) The analysis process 1.1 What is Software Engineering?Solving Problems (continued) The synthesis process 1.1 What is Software Engineering?Solving Problems (continued) Method: refers to a formal procedure Tool: an instrument or automated system for accomplishing something in a better way Procedure: a combination of tools and techniques to produce a product Paradigm: philosophy or approach for building a product 1.1 What is Software Engineering?Where Does the Software Engineer Fit In? Computer science: focusing on computer hardware and programming languages Software engineering: focusing on computer as a problem-solving tool 1.1 What is Software Engineering?Where Does the SW Engineer Fit in? (continued) Relationship between computer science and software engineering 1.2 How Successful Have We Been? Perform tasks more quickly and effectively Word processing, spreadsheets, e-mail Support advances in medicine, agriculture, transportation, multimedia education, and most other industries However,