Schedule Adherence: Fix the Rules Before Blaming the Plan

Schedule adherence becomes useful when the business agrees which schedule is being measured, when it is fixed, and how changes are recorded. Rewriting the plan after every disruption can make the score look good while hiding unstable execution.

Choose a commitment point

Define the period covered and the moment the schedule becomes the reference. A shift schedule, daily plan, and weekly capacity plan serve different purposes. Avoid comparing actual output with whichever version happens to be visible at the end of the day.

Record quantities, product mix, and the definition of completion. Finished production, released quality status, and shipment readiness are not interchangeable milestones.

Keep authorized changes visible

Some changes are necessary. A customer emergency, quality hold, or equipment failure may require a new sequence. Record the reason, decision owner, and impact instead of erasing the original commitment.

In a hypothetical review, a line could complete its revised schedule every day while repeatedly missing the work originally promised to assembly. Reporting both the original plan and approved revisions helps leadership see whether execution or planning stability needs attention.

Classify misses by cause

Separate missing material, unavailable tooling, quality issues, equipment losses, unrealistic capacity assumptions, and priority changes. Review recurring causes at the process with the responsible functions.

A category labeled “operator issue” is rarely specific enough to improve. Ask whether instructions, skills, readiness, and staffing matched the plan before attributing the gap to an individual.

Pair adherence with customer and flow measures

Track good output, on-time completion, backlog, and work in process. A perfectly followed schedule can still produce the wrong mix or release work too early.

Use the measure to improve the planning and execution agreement. The goal is a schedule people can rely on, with clear exception decisions and a shared understanding of what prevents it from being achieved.

Continue reading: EPEI Production Wheels: When a Repeating Schedule Helps.