Shainin is a Problem Solving Methodology that can be used to solve long lasting chronic process variance problems in otherwise stable and controlled environments. The methodology uses the conclusion that in a cause–effect relationship the impact on product quality of one variable has to be stronger than the impact of others. Through strategic change of parameter values or equipment the methodology attempts to generate a clearer understanding of the problem quickly by replicating what is called BOBs (Best of the Best parts) and WOWs (Worst of the Worst parts) and interpreting the results and the effects the parameter and equipment changes had on the part’s quality.

Used in the right way Shainin can complement and speed-up conventional ‘experimental’ problem solving significantly. Also the often used DOE (Design of Experiments) method used in the SixSigma approach can be drastically sped up with using the Shainin approach.