The nature of the problems that may arise with the system in this p hase, as well as techniques and tools for performing maintenance, are presented.

• 实验和例子既考虑到学生有限的实践经验，同时使学生了解大型软件开发项目如何由基本的需求逐步变成现实的软件系统，从软件工程的基本原理、方法和应用等方面。