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Controlling quality - Coggle Diagram
Controlling quality
What are current problems?
Pareto chart
80/20 rule
High mistakes come from low number of causes
Checklist
Collect quantitative data
Stratification
Divide data
Sub-categories
Break-down into specifics
Are there any correlations?
Scatter diagram
Does not prove
Suggests relationships
Is it improving?
Histogram
Data
Standard deviation
Distribution
Mean
Is it in control?
Control chart
Controls limits
Upper
Take action
Monitor performance
Drift before reaching limits
Lower
What is causing problems?
Cause and effect
AKA
Ishikawa diagram
Fishbone diagram
Visualisation
Narrow down
Address
Can be used individually
More powerful together