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Plan-do-check-action (PDCA)
Sometimes referred to as the Shewhart Cycle, for the inventor - Walter A. Shewhart. A four step process for quality improvement: Plan - A plan to effect improvement is developed. Do - The plan is carried out, first, on a small scale if possible. Check - The effects of the plan are observed. Action - The results are studied and observed to determine what was learned and what can be predicted.