We left off the last post talking about the value of measuring PM Compliance in our CMMS. Many organizations use the +/- 10 % rule, whereby if they complete the PM within 10% of the frequency it is considered to be compliant. Now this is a good measure if you are looking to determine whether you get the PMs issued and completed on time but what else does it tell you about the PM – what does it tell you about how the PM was completed or whether we have prevented or mitigated a failure (the purpose of PMs)? The answer is – next to nothing and over the years I have seen many a PM completed from the comfort of the lunchroom and PMs that don’t really explain what it is they are there for.