非功能性需求的陈述经常是没有被明确定义的，这使得它们很难被估量和测试。
Often, NFR statements are soft and not clearly defined, which makes them hard to measure and test against.
这不仅仅是因为我们能从朋友那儿得到有建设性的建议和后援支持，还有从一段友谊中获得的被理解，被支持的感受，这些对我们的益处也是不可估量的。
Not only do we get practical advice and logistical support from friends, but the benefits of feeling understood and supported are immeasurable.
并被要求解一个简单的迷宫。为了评测求职者的自信心，他们被要求估量自己在十五分钟内能解多少个迷宫。
Sume and were given a simple maze to solve. To measure self-confidence, job applicants were asked to estimate how many mazes they could solve in fifteen minutes.
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