What it shows
Internal and external failure cost divided by appraisal cost: how much failure cost there is for every unit of currency spent on checking.
Why it matters in manufacturing
Appraisal is meant to find and stop problems before they cost more. If checking works better, the failure that is left gets smaller compared with what you spend on checking.
How to read it
Lower is better. The tag compares with the same period last year. A falling value while the process control share rises is the shift-left paying off.
What good looks like
The value falls year on year: each unit spent on checking goes with less failure cost, especially while the process control share rises.