The Common Trap
Many facilities proudly report 95–100% PM compliance.
But here’s the uncomfortable question:
Did those PMs actually prevent failures?
Compliance measures whether work was done.
Effectiveness measures whether the work mattered.
They are not the same thing.
What PM Compliance Really Tells You
PM Compliance answers:
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Were PMs completed on time?
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Did technicians follow the schedule?
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Is the CMMS workflow functioning?
It’s a process metric, not a reliability metric.
High compliance with poor PM design still produces:
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Reactive work orders
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Emergency breakdowns
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Frustrated technicians
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Wasted labor hours
What PM Effectiveness Looks Like
Effective PMs should move these needles:
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Increased MTBF
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Reduced emergency CMs
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Lower repeat failures
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Fewer post-PM breakdowns
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Stable asset performance
If those aren’t improving, the PM is probably busywork.
Red Flags Your PM Program Isn’t Effective
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Failures occur days after a PM
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“Checked / OK” is the most common PM result
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PMs generate corrective work after failure
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PM labor hours keep rising, but uptime doesn’t
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Technicians can predict failures better than the PM schedule
These are signals that the PM task content—not the schedule—is the issue.
Why Facilities Overvalue Compliance
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It’s easy to measure
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It looks good in reports
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Management understands percentages
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Auditors ask for it
Effectiveness requires analysis, context, and sometimes admitting the PM needs to change.
Shifting the Focus: From Compliance to Impact
Ask better questions:
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Which PMs actually prevent failures?
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Which PMs never find issues?
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Which assets fail despite perfect compliance?
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Which PM tasks trigger corrective work before failure?
Start tracking:
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PMs that generate follow-up WOs
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Failures between PM cycles
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Repeat failures by asset
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PM labor vs. avoided downtime
A Practical Way Forward
Most facilities succeed by:
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Keeping compliance targets (you still need discipline)
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Reviewing PMs quarterly using failure data
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Retiring or reducing PMs with no impact
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Converting some tasks to condition-based triggers
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Letting technicians flag “non-value PMs”
The goal isn’t fewer PMs—it’s better PMs.
Field Perspective
A PM done on time but poorly designed is just scheduled failure.
A PM done late but targeted at the right failure mode may be far more valuable.
Open Discussion
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Have you seen high PM compliance but constant breakdowns?
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What metrics do you use to judge PM effectiveness?
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Which PMs in your facility feel like checkbox work?
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How much say do technicians have in PM design?
Let’s compare notes—compliance keeps you organized, but effectiveness keeps you running.