The 5-Why method, also 5 -W method or short 5 Why or 5W called, is a method in the field of quality management to the cause -and-effect determination. The aim of this application of the five " Why? " Questions is to determine a cause of a defect or problem. The number of requests is not limited to five, this number is to be understood symbolically. It is important that is dug deeper until the faulting process step is clearly identified and is no longer divisible. You can check this for example, by the causal link is formulated vice versa.
Problem: The car will not start.