Discovery through the 5 why’s

By repeatedly asking the question “Why” (five is a good rule of thumb), you can peel away the layers of symptoms which can lead to the root cause of a problem.

See: isixsigma’s full explaination

Below is the simplest visual i’ve found.

5 Why Worksheet22

 

You can find a more in-depth explanation here and a more in-depth decision tree version here.