So in PDCA your first step is to use all available knowledge and establish your objective.
FORBES: How To Turn Obstacles Into Assets In The Real World
In PDCA, if you get off course, the assumption is you will get back on track as quickly as possible.
The Deming, or (Walter A.) Shewhart PDCA Cycle as some people call it, is often used to improve the quality of products and services.
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