p-Chart A control chart based on the proportion of nonconforming units per subgroup. The p-chart is based on the binomial distribution.
PDCA The Plan-Do-Check-Act cycle is a four-step process for quality improvement. Plan: A plan for improvement is developed. Do: Experiments are initiated to test the feasibility of the
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plan, or the plan is carried out. Check (or Study): The effects of the plan are observed. Act: The results are studied to see what was learned and
what can be predicted. If the result of the experiment was an increase in quality, it is made standard operating procedure. If quality decreased
The cycle continues until the desired improvement is realized.