对多视点方法来说 ，各视点不同的利益观可能导致视点之间的重叠需求相对于不同视点优先级设定方面的不一致性 。
In the framework of viewpoints, the differences between the assessments on requirement benefit and risk in different viewpoints could cause inconsistency in prioritizing overlapped requirements.
同样，重叠的演进包含风险，如果存在对后面演进中的架构和需求的重大变更，那么这些可能影响更早的演进。
Also, overlapping evolutions does involve risk; if there are significant changes to the architecture or the requirements in later evolutions, then these may affect earlier evolutions.
这意味着，任何由过度积极的重叠迭代团队生成的详细的需求都不得不被扔掉或重写，且增加了开发的成本。
This means that any detailed requirements produced by an overly aggressive overlapping-iterations team will have to be thrown away or rewritten, increasing the cost of development.
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