在ISO 9421里提到，某一事物的可用性应当可以以效力(effectiveness)、效率(efficiency)和满意度(satisfaction)三个维度来进行衡量。
ISO 9421 says that the usability of something should be measured in terms of it's effectiveness, efficiency and satisfaction.
如果像肯尼迪这样的人愿意保持演讲的简短以最大化他们作为演讲者的效力，我们也应该足够聪明做同样的事情。
If people like Kennedy are willing to keep it short to maximize their effectiveness as speakers, we should be smart enough to do the same thing.
以最高水平的效力服务客户意识着不仅仅是响应，而是提早预期。
Serving customers at the highest level of effectiveness means far more than being responsive, it means being anticipatory.
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