PDCA

The phrase "Plan, Do, Check, Act" (PDCA) refers to a cyclical problem-solving and continuous improvement model. It is commonly referred to by the names of PDCA/Deming cycle/Shewhart cycle.

PDCA stands for Plan-Do-Check-Act, also called the Deming cycle/Shewhart cycle, is a "cyclical method for continuous improvement in business processes. It's also known as the Shewhart cycle or the Deming cycle. The four steps are designed to be repeated iteratively, allowing for ongoing refinement and optimization."

Kaizen, which is Japanese for "improvement", when used in a business sense refers to continuous improvement in business activities. It involves every employee/manager.