Key takeaways
See our guide to maintenance planning and scheduling.
A maintenance technician's shift contains a lot of non-wrench time. They search the storeroom for a part that turns out not to be in stock. They walk to an asset only to find it cannot be accessed because production is still running it.
They start a job and discover they do not have the right tool or the right procedure. Each of these is wasted time, the technician is on the clock but not making progress.
Studies of maintenance organisations consistently find that without a planning function, technicians spend only 25-35% of their shift actually performing maintenance. The rest is the searching, waiting, and figuring-out. A planning function that prepares the work in advance, confirming the parts are in stock and staged, the access is arranged, the procedure is documented, the labour is estimated, can lift wrench time to around 50-55%.
That improvement is large. Going from roughly 35% to 55% wrench time lifts effective maintenance capacity by about half again, a 30-person crew performing like 47, without hiring anyone. This is why the planner-scheduler is the highest-leverage role in maintenance, and why getting it wrong is so costly. The article on manufacturing KPIs covers wrench time and the related capacity metrics.
Planning happens before the work is scheduled. For each job in the backlog, the planner:
This preparation is what converts a vague backlog entry into a job a technician can pick up and execute without searching or waiting. It is also the part most plants skip, because it is invisible work, the planner is preparing jobs that have not happened yet. The piece on the work order management system covers the data structure that good planning produces.
Scheduling happens after planning. The scheduler takes the prepared jobs and sequences them against available windows, available technicians, and the maintenance-window calendar. Scheduling is the more visible function and the one plants tend to do at least partially. But scheduling unprepared work just sequences the searching and waiting, the technician still arrives at a job without the parts staged. Scheduling without planning produces a tidy calendar of inefficient jobs.
The honest measure of whether the planning function is working is wrench time: the percentage of paid maintenance hours spent actually performing maintenance. It is measured by sampling, observing technicians at random intervals and recording whether they are wrenching, searching, waiting, travelling, or idle.
The benchmark:
Most plants that have never measured wrench time are shocked by how low it is. The measurement itself is often the catalyst for investing in planning. The piece on root cause analysis covers how wrench-time losses trace back to specific planning gaps.
A good planner-scheduler is not the most senior technician promoted as a reward, and not an administrator who has never turned a wrench. The role needs:
The common hiring mistake is promoting a great technician who then misses the wrenching and keeps getting pulled back to the floor. The planner-scheduler is a distinct role with a distinct skill set, not a senior-technician reward.
One planner-scheduler can typically support 15-25 technicians, depending on the complexity of the work. Below that ratio, the planner has spare capacity; above it, jobs start going out unprepared. For a plant with fewer than 15 technicians, the role might be part-time or combined with another function, but the planning work still needs to happen, even if not by a dedicated person.
The payback math is straightforward. If a planner-scheduler lifts wrench time from roughly 35% to 55% across 20 technicians, the effective capacity gain is equivalent to more than ten additional technicians' worth of wrench time, for the cost of one planner. Few maintenance investments come close to that return. The piece on the preventive maintenance schedule covers how planning interacts with PM execution.
The planning function works in any CMMS, but the quality of the planning data determines the wrench-time gain.
Where a unified OEE + CMMS platform helps is that the planner has the parts inventory, the asset history, the failure mode catalogue, and the maintenance-window calendar in one place, so preparing a job is a fast assembly rather than a hunt across systems.
Fabrico is built so the planner can prepare work efficiently and the wrench-time gain is measurable. To see what a planning workflow looks like against your backlog, book a demo .
The planning work still needs to happen; it just gets distributed. For a small team, the maintenance manager or lead technician does the planning for the next day's or week's work in a dedicated block, protected from interruption. The function is essential even when the role is not full-time.
Work sampling, a trained observer records what each technician is doing at random moments over a representative period. It is non-continuous and non-intrusive, and a week of sampling gives a reliable estimate. Some plants now derive a proxy from mobile-CMMS activity timestamps.
Wrench time starts improving within the first month as the first prepared jobs flow through. The full gain takes a quarter or two as the planner builds up a pipeline of prepared work ahead of the technicians. The improvement is visible and measurable throughout.
For most mid-market plants, one person does both, the functions are closely linked and the volume usually does not justify splitting them. The split makes sense only at larger scale. What does not work is doing the scheduling without the planning.
Hiring a planner and then letting them get absorbed into reactive work. Within a quarter the planning stops and the role degrades into a reactive coordinator or a parts clerk. The planner has to be protected from the daily firefight, or the function the role exists to provide never materialises.
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