problem:5_why

Problem Solving

5 Why

Explore the cause-and-effect relationships underlying a particular problem - determine the root cause of a defect or problem by repeating the question “Why?” five times

Snippet from Wikipedia: Five whys

Five whys (or 5 whys) is an iterative interrogative technique used to explore the cause-and-effect relationships underlying a particular problem. The primary goal of the technique is to determine the root cause of a defect or problem by repeating the question "Why?" five times. The answer to the fifth why should reveal the root cause of the problem.

The technique laid out by Taiichi Ohno is to ask "Why?" exactly five times, to find exactly one root cause. In practice, this is a poor root cause analysis tool, as root cause analysis is rarely linear, there is rarely as single root cause, and rarely are there exactly five issues that point to a root cause. To alleviate this, the Five Whys are sometimes misinterpreted to ask "Why?" more than five times, and to have multiple starting questions. There is no formal literature published on these diverging interpretations. Some suggest abandoning the five whys entirely for this and other reasons (see § Criticism). Even when the method is closely followed, the outcome still depends upon the knowledge and persistence of the people involved.

  • problem/5_why.txt
  • Last modified: 2022/08/13 12:36
  • by Henrik Yllemo