Juran Trilogy
Updated 2026-08-22
INTRODUCTION
English translation pending.
CORE DEFINITION
Proposed by Joseph Juran, the trilogy divides quality management into three progressive processes: quality planning sets goals and designs the processes that will meet them, quality control monitors performance against the standard and corrects deviation, and quality improvement runs breakthrough projects that raise the standard itself. The key qualification is that the three form a continuing loop rather than a one-time campaign.
SCAFFOLDING EFFECT
Reduce cognitive load
- Stage map: locate each quality problem in planning, control, or improvement before acting. - Gap closing: fix control failures first, then schedule breakthrough improvement for chronic issues. - Loop discipline: restart the planning stage whenever a new standard has been firmly established.
Anchor fast decisions
Defects arise from three separable causes: wrong design, unstable execution, and an outdated standard. Assigning each failure to its own stage lets planners correct the matching process instead of blaming inspection, and the improvement stage attacks chronic defects that control alone can only contain.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- zh.wikipedia.orghttps://zh.wikipedia.org/wiki/%E6%9C%B1%E5%85%B0%E8%B4%A8%E9%87%8F%E6%89%8B%E5%86%8Cverified
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