This page is for anyone who reads a booking sheet and finds a line's combined booked quantity exceeding its weekly capacity. Lesson 8.2.3 showed how to add every commitment to a line and week together; this lesson deals with what follows once that combined total is too high. It mainly teaches a decision: whether an overbooked line can simply be left as a scheduling detail, or whether it needs a real, costed response before any date is confirmed.
This matters most for a domestic Make to Stock brand like Cedar & Co., producing its own stock against its sales forecast at Delta Garments, where an uncorrected overbooking risks empty shelves rather than a single missed sailing date. An overbooked line cannot produce more than its actual capacity for free, whatever quantity is written on the sheet.
Without a costed response, an overbooked line looks like a problem to "sort out later," and every day it stays uncorrected narrows the options left to fix it. This lesson gives you the method: calculate the shortfall, cost closing it with overtime, and choose a real response before confirming anything to a buyer.
You need: a line's total booked quantity and its actual weekly capacity, both read from the booking sheet built in lesson 8.2.3. You do not need to have handled an overbooking before.
By the end of this lesson you can:
Not covered here: building the booking sheet itself (lesson 8.2.3), and running the complete capacity-planning method end to end for a brand-new order (lesson 8.2.5).
| Term | Meaning |
|---|---|
| Overbooking | Booking more quantity onto a line or period than its actual daily capacity can produce, so the booked total exceeds what the line can deliver on time without added cost. |
| Booking sheet | A shared record that lists which lines are committed to which orders, in which weeks, and how much of each line's capacity each commitment uses, so every booking can be checked against the same total. |
| Capacity utilisation | The share of a factory's available capacity actually being used by confirmed orders, expressed as a percentage of its maximum output. |
| Make to Stock (MTS) | Producing against the seller's own sales forecast, rather than a single confirmed buyer order. |
| Theoretical daily capacity | The number of pieces a line could produce in a day if every available minute converted directly into output at the operation's SMV, before any efficiency loss is applied. |
A line is overbooked in a given week when the total quantity booked to it exceeds its actual weekly capacity from lesson 8.2.3. The shortfall is the booked quantity minus actual capacity, and that shortfall has to be closed by one of a small set of real responses: added overtime capacity at a cost, splitting the excess onto another line, delaying part of the order, or declining part of the booking. An overbooked line cannot simply produce more than its actual capacity for free.
The shortfall, in pieces, when Line 1's combined booked quantity of 9,700 pieces exceeds its actual weekly capacity of about 8,988 pieces.
A person who has only ever seen a small, easily-covered shortfall should not assume every overbooking looks the same. The shortfall calculation does not change; the right response to it does.
| What can differ | The shapes you meet | Why it matters |
|---|---|---|
| Small shortfall covered by overtime | A shortfall of a few hundred pieces can often be closed with a limited amount of paid overtime, at an order's own fixed overtime cost, without changing the delivery date. | The cheapest, fastest response, available only while the shortfall stays small. |
| Large shortfall needing a later delivery date | A shortfall too large to close with overtime within the remaining schedule forces the factory to push part of the order's delivery to a later week or move part of it to another line. | Overtime is not unlimited; a large enough shortfall exceeds what added hours can realistically cover. |
| Overbooking discovered before production starts, versus discovered mid-production | An overbooking found while still building the booking sheet costs only the time to re-plan; the same overbooking discovered only after production has already started on the assumption of full delivery risks a missed shipment date. | The shortfall becomes real lost time, not just a planning error, once production is already running. |
| Export order overbooking versus domestic order overbooking | An overbooked export order for a buyer like Northline Apparel risks a missed sailing date against a fixed shipping timeline; an overbooked domestic Make to Stock order for Cedar & Co. instead risks Cedar & Co.'s own shops running short of stock against its sales forecast. | Different consequences follow the same shortfall, but the shortfall itself is calculated the same way either time. |
Karim tells Mona that Line 1's booking sheet now shows 9,700 pieces booked for the week, illustrative, against an actual weekly capacity of about 8,988 pieces, and Mona has already told Sara the delivery date is confirmed. The 9,700-piece figure reflects Order A's own shape plus Cedar & Co.'s domestic Make to Stock run for its own shops, both booked to Line 1 the same week.
| Fact | What it tells Karim and Mona |
|---|---|
| Line 1's actual weekly capacity, about 8,988 pieces (illustrative) | The ceiling everything booked to Line 1 that week must fit inside |
| Total booked quantity, 9,700 pieces (illustrative) | The combined total from lesson 8.2.3's method, now exceeding the ceiling |
| The shortfall, about 712 pieces | The gap that must be closed by a real response before production runs |
| Mona's status | She has already confirmed the delivery date to Sara, before this shortfall was found |
This example is illustrative, not a claimed fixed academy fact: if Line 1's combined booked quantity that week were 9,700 pieces against Line 1's actual weekly capacity of about 8,988 pieces, the shortfall is 9,700 − 8,988 ≈ 712 pieces. Closing that shortfall with overtime, using Order A's own fixed rate, costs 712 × USD 0.15 ≈ USD 106.80, a real, calculable cost of the overbooking, not an unavoidable loss, provided it is caught and corrected before the delivery date is confirmed.
The cost, in USD, of closing the 712-piece shortfall with overtime, at Order A's own fixed overtime rate of USD 0.15 per piece.
A common mistake is treating an overbooked line as a scheduling detail to "sort out later" rather than a decision that has to be made and costed before a delivery date is confirmed to a buyer. Once a date is confirmed on top of an uncorrected overbooking, every one of the four responses becomes more expensive or more damaging than it would have been if chosen at the booking stage.
A line is overbooked when more has been promised to it in a week than it can actually make that week. The gap between what is booked and what the line can really deliver is the shortfall, and it has to be closed somehow: paid overtime, moving part of the work to another line, a later delivery date, or turning down part of the booking. None of these choices is free, but all of them are cheaper than discovering the shortfall only after production has already started on the assumption that everything would fit. Waiting and hoping is not one of the real choices.
Karim tells Mona that Line 1's booking sheet now shows 9,700 pieces booked for the week (illustrative), against an actual weekly capacity of about 8,988 pieces, and Mona has already told Sara the delivery date is confirmed.
Karim's message to Mona:
Now that the shortfall is known, should Mona simply wait and see whether the line happens to catch up, since the date is already confirmed?
No. Mona should choose and cost a real response now: closing the roughly 712-piece shortfall with overtime costs about USD 106.80 at Order A's own fixed overtime rate, a known, bounded cost, versus an uncosted risk of missing the confirmed date if nothing is done.
First, the shortfall (about 712 pieces) will not close itself once actual weekly capacity is already fixed.
Second, the cost of correcting it now (about USD 106.80 in overtime) is far smaller and more certain than the cost of a missed shipment discovered only near the sailing date.
Waiting turns a small, known cost into an unmanaged risk.
Correcting the shortfall now with overtime costs about USD 106.80 (illustrative).
The overtime cost, in USD, of closing the shortfall now, at Order A's own fixed overtime rate.
Leaving the same shortfall uncorrected until close to the confirmed delivery date instead risks a missed sailing date on Order A's own fixed 16-week timeline, which carries the much larger, harder-to-recover cost of a damaged buyer relationship and, potentially, air freight to meet the date instead.
Order A's own fixed air freight cost of USD 1.80 per piece applied to the same 712-piece shortfall, more than ten times the overtime cost for the same quantity.
This lesson uses the "Overbooking Consequences" sheet of the course's Capacity booking calculator, which calculates shortfall, the extra minutes needed and overtime cost from figures already entered on the "Multi-Order Booking Sheet". Enter the order's own overtime rate once, and the sheet flags any line and week where booked quantity exceeds capacity. Download link: the course tool, `templates/T08-C02-capacity-booking-calculator.xlsx`.
1. When is a line considered overbooked for a given week?
2. A line's actual weekly capacity is 5,000 pieces and 5,300 pieces are booked to it. What is the shortfall, and what would it cost to close with overtime at USD 0.15 per piece?
3. Why is discovering an overbooking before production starts less costly than discovering it mid-production?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| Overbooking | الحجز الزائد | Surréservation | Aşırı rezervasyon | Booking more quantity onto a line or period than its actual daily capacity can produce, so the booked total exceeds what the line can deliver on time without added cost. |
| Booking sheet | ورقة الحجز | Fiche de réservation | Rezervasyon tablosu | A shared record that lists which lines are committed to which orders, in which weeks, and how much of each line's capacity each commitment uses, so every booking can be checked against the same total. |
| Capacity utilisation | معدل استغلال الطاقة الإنتاجية | Taux d'utilisation de la capacité | Kapasite kullanım oranı | The share of a factory's available capacity actually being used by confirmed orders, expressed as a percentage of its maximum output. |
| Make to Stock (MTS) | إنتاج حسب المخزون | Fabrication sur stock | Stoğa üretim | Producing against the seller's own sales forecast, rather than a single confirmed buyer order. |
| Theoretical daily capacity | الطاقة اليومية النظرية | Capacité journalière théorique | Teorik günlük kapasite | The number of pieces a line could produce in a day if every available minute converted directly into output at the operation's SMV, before any efficiency loss is applied. |
You now know how to spot an overbooked line and cost a real response to it. The next lesson carries a brand-new order through the whole course's method, from a line's daily capacity to a confirmed, costed delivery date. Back to the course map