Give Rework and Trials a Place on the Schedule
How should production planning reserve capacity for rework, retests, and qualification runs?
The line serves more than customer orders. It may also serve approved rework, qualification trials, retests, and recovery production.
If that work is absent from the schedule, the plan can promise first-pass output from hours already needed elsewhere.
Create a separate demand record
For each known nonstandard run, record its quantity, routing, required resource, setup, expected duration, release dependencies, and completion need. Identify its owner and confidence in the estimate.
Do not schedule held product for rework before the responsible owner has authorized that disposition. Where the outcome remains uncertain, represent scenarios or a planning allowance rather than an invented firm order.
Keep trial demand traceable to a qualification decision. A repeated trial should explain what the earlier run failed to establish and why another production slot is needed.
Book the resource actually used
A visual inspection in a separate area does not occupy the main packaging line. A rework run on that line does. Include preparation, changeover, and cleanup where they consume the same resource.
Avoid overlapping bookings. If a trial produces saleable output that can satisfy an order after authorized release, do not automatically count the trial quantity and the customer order as two independent production requirements.
Keep repeated processing separate from first-pass good output in performance reporting.
Reserve uncertainty deliberately
A hypothetical week with forty available line hours, thirty-six hours of firm orders, and six hours of approved rework is two hours short before further allowances. Better bookkeeping does not recover those two hours. It reveals a choice the planner must make.
Compare an adjusted delivery sequence, an additional operating window, a different approved route, or prevention of recurring rework. Include the costs and service consequences of each.
For uncertain future rework, base the reserve on relevant history and the consequences of being wrong. Do not use a universal percentage.
Close the loop after the run
Compare planned and actual secondary demand. Identify repeated setup, avoidable retesting, missing samples, or unclear release dependencies that consume resources.
The objective is neither to normalize endless rework nor to pretend it disappears. It is to make the real capacity commitment visible while the plant still has time to respond.