Apply PDCA

Run a disciplined four-phase cycle — Plan, Do, Check, Act — to make improvements systematically, learn from each iteration, and lock in gains before scaling.

Why This Is Best Practice

Adopted by: ISO 9001 (adopted by 1.1 million organizations in 170 countries as of 2022), Toyota Production System (Kaizen), Six Sigma (DMAIC is a direct extension), NHS (UK National Health Service quality improvement), U.S. Department of Defense, and standard curriculum in every accredited operations management program globally. Impact: Toyota's application of PDCA-based Kaizen is directly credited with its position as the world's most efficient major automaker — Toyota's defect rate is consistently 50–70% lower than industry average (J.D. Power IQS longitudinal data). ISO 9001 meta-analyses show certified organizations achieve 15–30% reduction in defect rates and measurable customer satisfaction improvement within two years of adoption (Psomas & Antony, 2015, International Journal of Quality & Reliability Management). Why best: Most improvement attempts skip the Check phase — they implement a change and assume it worked. PDCA enforces measurement of actual results against predicted results before locking in or scaling the change. This prevents three failure modes: improvements that don't actually work, improvements that work but create side-effects, and improvements that are scaled before they're understood.

Sources: W. Edwards Deming "Out of the Crisis" (1986); Shewhart "Statistical Method from the Viewpoint of Quality Control" (1939); ISO 9001:2015 §10.3; Psomas & Antony (2015) IJQRM

Steps