Five whys
The five whys is an exploratory technique that chains questions together to investigate the causes of a problem
What it means, how it is used and where it comes up, with its related concepts.
What it is and how it works
The number five is indicative. Each answer should be based on observations and may open several causal branches. It is useful for starting an analysis, but the conclusions should be tested and complex problems should not be attributed to a single cause or a single person.
Also known as
5 whys