Reorganising processes so they are precise and prediction is helpful but not enough. In the diagram, the red dots are hitting the target in a predictable way. However, while they may be precise, they are not accurate. The green dots, with less precision, are more accurately placed around the bulls eye.
What I learn from this is the need to
- know the definition and position of the bullseye (what is the purpose of the process being improved)
- measure for accuracy as well as measuring variation
- fix accuracy first, then go for reduced variation
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