In the same vein, Hinley describes two of Lehman's laws of software evolution: The law of continuing change: Systems that are used must change, or else automatically become less useful.
同樣的道理，Hinley描述二種雷曼軟體演化法則： 持續變更法則：使用的系統必須變更，否則自動變得不那麼有用。