Production control: closing the loop between the plan and what was built

Release is a gate, not a formality

An order should not go to the floor until its material is available or reliably imminent, its tooling exists and is serviceable, the documentation and specification are current, and capacity has been allocated. Releasing without these checks moves the problem to the least equipped place to solve it, since a supervisor discovering a shortage mid-shift has fewer options than a planner discovering it a week earlier. Make the gate explicit, list what is checked, and record refusals. The pattern of refused releases is one of the most useful diagnostics a plant has, because it names the upstream function that keeps failing.

Monitoring the few signals that actually predict trouble

Monitoring everything produces reports nobody reads. The signals worth watching continuously are progress against the sequence at the pacing resource, the state of the protective buffers, open jobs that have not moved, and unplanned stoppages as they occur. These predict late delivery earlier than any completion report. Set thresholds that convert each signal into an action rather than an observation, and give each threshold an owner. A dashboard with no defined response is decoration; the value lies in the agreement that when a particular indicator crosses a line, a particular person does a particular thing.

Intervention authority has to be decided in advance

During a shift, someone must be able to authorise overtime, break a sequence, split a batch, release material early or stop a line without waiting for a meeting. Where that authority is undefined, the default is that nothing happens until the next morning, by which time the recoverable hours have gone. Write down what the shift supervisor may decide alone, what needs the production manager, and what needs the plant manager, and include the spend limits. Then check that decisions taken under pressure are being recorded, since an unrecorded intervention cannot be reviewed and tends to become an informal precedent.

Attributing variance while people still remember

Every order closes with a difference between what was planned and what occurred: hours, quantity, material consumed, scrap. Attribution done at the end of the accounting period produces guesses; attribution done at the time produces causes. Build a short, honest cause list that supervisors can apply quickly, resist expanding it until it becomes unusable, and review how the codes are being used so that a catch-all category does not swallow most events. The output is not a cost report but a ranked list of what disrupts the plant, which is the only credible input to an improvement plan.

Closing the order and feeding the next plan

Closure means confirming the quantity produced and accepted, recording scrap and rework, returning unused material, releasing tooling, and completing whatever record the product requires. Orders left technically open distort stock, capacity and cost, and they accumulate quietly until someone attempts a reconciliation. The other half of closure is feedback: where actual hours or yields differ persistently from the standards used to plan, the standards should be corrected rather than tolerated. That correction is what turns production control from a policing activity into something that improves the accuracy of every subsequent plan.

Frequently asked questions

Should production control sit under planning or under operations?

Either works, but the reporting line changes the bias. Under planning, control tends to defend the schedule and can be slow to accept floor realities. Under operations, it tends to accommodate the floor and lets the schedule erode. The practical safeguard is a daily meeting where both sides review the same deviation list, and a rule that any change affecting a customer commitment is recorded and visible regardless of which function authorised it.

How much detail should the floor be asked to report?

Only what changes a decision. Every reported field costs time at the point of work and degrades in accuracy as the list lengthens. Start from the decisions that need data — sequence, buffer state, loss causes, quantity accepted — and ask for those. If nobody can name what a field is used for, stop collecting it. Plants often find that shortening the reporting requirement improves the accuracy of what remains enough to be a net gain.

What is the difference between production control and production planning?

Planning decides what should happen over a horizon of weeks; control makes it happen over a horizon of hours and days, and reports back what actually occurred. Planning is analytical and works in advance; control is executive and works in the present, with authority to deviate. The two fail together when there is no feedback path, because planning then keeps producing schedules from standards that the floor has already proved wrong.