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Production follow-up is the daily discipline of checking an order's actual progress against its plan — not once at the end, but continuously, so a small delay gets caught and recovered while there's still time to act on it.
How many pieces entered a stage (e.g. cut panels fed into sewing) on that day.
How many pieces came out completed from that stage on the same day.
The running total still left to complete, updated daily against the order's total quantity.
The gap between where the order should be today (per the T&A plan) and where it actually is.
Spotting a delay is only half the job. Once a shortfall is confirmed, a recovery plan answers the practical question: how does this order get back on schedule? Common recovery actions include authorised overtime, temporarily borrowing capacity from another line, or — only as a last resort — renegotiating the delivery date with the buyer before it becomes an unpleasant surprise closer to shipment.