5 Whys (Why Why) Analysis

The Japanese Industrialist, Sakichi Toyoda, an inventor and founder of Toyota Industries, developed the 5 Whys (Why Why) Analysis in the 1930s. It became popular in the 1970s, and Toyota still uses it to solve problems today. it has become Popular Problem Solving Technique

Toyota has a "go and see" philosophy, Which means that its decision making is based on an in-depth understanding of what's actually happening on the shop floor, rather than on what someone in a boardroom thinks might be happening.

The 5 Whys Analysis is true to this tradition, and it is most effective when the answers come from people who have hands-on experience of the process or problem in question.

The method is remarkably simple: when a problem occurs, you drill down to its root cause by asking "Why?" five times. Then, when a counter-measure becomes apparent, you follow it through to prevent the issue from recurring.

FOR Detailed Knowledge and Practical  Adoption Watch above Tutorial on 5 WHYs (WHY WHY) ANALYSIS.