GuideApproved
Reducing scrap with Pareto analysis
Usually 80% of scrap comes from 20% of causes. This method helps you find that 20%.
13 Aug 20265 minValid until 3 Oct 2027
Collect data
Log scrap for two weeks by defect type, machine and shift.
Pareto chart
Sort defects from most to least frequent and focus on the top two or three.
Root cause
Run 5 Whys for each major defect.
Suggested actions
- Log scrap for two weeks by defect, machine and shift
- Draw a Pareto chart and focus on the top three causes
- Run a 5 Whys analysis on each top cause
Possible causes
- Incorrect machine settings
- Variable raw-material quality
- Insufficient operator training
Required documents
- Scrap and returns report
- Raw material specs and supplier list
