在此层级的每一级上，我们将使用功能分析来派生需求，并用工程方法来得出有效性度量。
At every level of the hierarchy, we would use functional analysis to derive requirements and engineering methods to derive measures of effectiveness.
如果价值度量正在提供给一个满足涉众需求的系统，一种方法就是定期去证明开发系统是针对关键的涉众。
If the measure of value is providing a system that meets stakeholder needs, one approach is to demonstrate the developing system to key stakeholders at regular intervals.
质量属性需求需要用好的度量方法指定。
Quality attributes requirements need to be specified with good measures.
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