The recurring aspects of designs are called design patterns. A pattern is the outline of a reusable solution to a general problem encountered in a particular context Many of them have been systematically documented for all software developersto use

Software engineers should avoid re-developing software already developed Types of reuse: Reuse of expertise Reuse of standard designs and algorithms

Procedural paradigm: Software is organized around the notion of procedures Procedural abstraction —Works as long as the data is simple Adding data abstractions —Groups together the pieces of data that describe some entity

Software is intangible Hard to understand development effort Software is easy to reproduce Cost is in its development —in other engineering products, manufacturing is the costly stage

7.1 User Centred Design Software development should focus on the needs of users Understand your users Design software based on an understanding of the users’tasks Ensure users are involved in decision making processes

介绍可重构的概念、可重构计算系统的基本结构、技术基础和技术关键;提出可重构计算机设计中存在的问题与解决方案

一、Windows窗口程序的基本结构 二、 Windows程序的基本结构

3－1 设计秒流量 3－2 给水管网的水力计算

猪场相关指标 计算结果 每年的天数(天)+A30 365母猪的繁殖周期(天) 163 猪场年生产能力(头)

1.了解软件质量定义和软件质量度量。 2.了解软件维护的类型与策略。 3.了解软件维护的过程与管理方法。 4.了解可维护性的概念。 5.了解提高可维护性的方法。 6.了解软件逆向工程与再工程的概念