Software Engineering help!

优秀软件应该有的属性(software attributes)
For important attributes are maintainability, dependability, performance and usability. Other attributes that may be significant could be reusability (can it be reused in other applications), distributability (can it be distributed over a network of processors), portability (can it operate on multiple platforms) and inter-operability (can it work with a wide range of other software systems). Decompositions of the 4 key attributes e.g. dependability decomposes to security, safety, availability, etc. are also possible answers.
要点：
1) maintainability : 开发出来的软件可以应对需求的变更
2) dependability : 软件运行稳定，安全
3) performance : 软件不会滥用系统资源(内存，CPU等)
4) usability : 有适当的用户接口(界面)和文档
5) reusability : 能被其他软件重用
6) portability : 可以跨平台
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