现在的系统一般都包括软件和硬件,需求分析在系统的生命周期中是非常重要的阶段.如果需求分析做的不好,会带来诸如项目失败、成本超出预算、延后等一系列问题.系统越复杂,需求分析活动就越发重要和困难.针对需求工程,提出了基于SysML进行需求分析的方法.该方法的主要优点是用户需求以图形化建模的方式表示,需求的关系被显示映射,系统分解在系统开发活动的早期就可以被考虑.最后,针对可信系统的用户需求,使用该方法进行了演示.%The system always contains software and hardware. Requirement analysis is a very important phase in a system life cycle. Poor requirement analysis will often lead to project failure,cost increase or delay,etc. The more complex a system is, the more difficult and important the requirement analysis is. Give a method of doing requirement analysis based on SysML. The advantage of the method is to represent user requirement as diagram,and the requirement relations are explicitly mapped. Requirement analysis on trusted system design is illustrated as an example with this method.
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