Taiichi OhnoFive Whys practice
Ask 'why' five times about every problem; beneath every symptom sits a process cause, and beneath that, usually a management-system cause.
Kaoru IshikawaGuide to Quality Control, 1968
The fishbone (cause-and-effect) diagram organises potential causes — people, methods, machines, materials, measurement, environment — so teams analyse structure rather than opinions.
The EclipseFrontiers® LensFix causes and problems retire. Fix symptoms and they return with interest.