这个方法通常在可行性分析和收集需求活动以后产生单一的评估。
The method is expected to produce a single estimate, usually after feasibility analysis and requirements gathering activities.
这个需求用分析机制来说，就叫做：持久化：无论程序是否运行，都一直维护数据的信息和状态。
This business requirement translates into an analysis mechanism called Persistence: the maintenance of information and state even when the application is not executing.
能力分析将要利用这个分层来检查供应和需求层次之间的缺口。
The capacity analysis will take advantage of this layering to examine the gap between supply and the layers of demand.
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