Causal Analysis and Resolution (CAR) helps to identify and rectify the root cause of a defect or problem. It can be applied to any process area. Analysis can be qualitative, limited to a fish bone diagram or so. And at the same time it can be more advanced involving quantitative data. The steps below show how to quantify the performance of CAR activities.
- Define a measurable parameter based on the root cause of the issue identified.
- Determine solution for fixing the root cause.
- Measure the performance of the parameter before and after implementing the change.
- Perform some hypothetical tests like 2 sample T test or paired T test on the measured parameter.
- Compare the predicted performance and actual performance of the data.
- If there is no statistically significant difference between the predicted performance and actual performance, it can be assumed that the changes are effective.
- If there is a statistically significant difference between the predicted performance and actual performance, it can be assumed that the changes are not effective and another CAR needs to be done.
