注意：精益中的“五个为什么”练习是一种建设性地使用“为什么”问题的方式，不过还是会挑战团队成员之间的互相信任。
(Note that Lean's "Five Whys" exercise is a constructive use of the same Why question, though it can be challenging on teams with trust issues).
一旦建立起工作流程，五个“精益思想”[Womack1996]的核心概念就可直接应用于整个工序。
Once the flow of work is established, the five core concepts of "Lean Thinking" [Womack1996] can be applied directly to the whole process.
“五个为什么”分析法源自于精益制造。
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