A buyer usually states the date it wants goods on a store's own selling floor before it states any date on the factory's own calendar. Working backward means starting from that fixed in-store date and subtracting, in order, every stage's own known length, until the date that remains lands on the factory floor as a cut date: the latest date cutting can start without missing the in-store date. This is chiefly an information-flow skill: turning a single date the buyer cares about into the full set of dates the factory needs to plan against, in the right order and with nothing skipped.
Without this step, a factory can agree to an in-store date without knowing whether its own cutting schedule can actually support it, and only discovers the conflict once production is already behind.
You need: a basic sense of a factory's own critical path and the fixed stage lengths that make it up. Lesson 1 of this course, on what the retail side adds after warehouse arrival, is useful preparation, though not required.
By the end of this lesson you can:
Not covered here: running one critical-path board across many styles and factories (Lesson 3), flagging a delay before it reaches the shop floor (Lesson 4), and building the complete retail critical-path tracker (Lesson 5).
| Term | Meaning |
|---|---|
| In-store date | The fixed date a buyer wants goods physically ready for sale on a store's own selling floor. |
| Cut date | The latest date a factory can start cutting fabric and still meet a fixed in-store date. |
| Backward scheduling | Starting from a fixed end date and subtracting each stage's own known length, in order, to find an earlier date. |
| Stage duration | The fixed number of days or weeks a single stage takes from its own start to its own finish. |
| Confirmation date | The date a buyer and a factory agree an order, the starting point of the factory's own critical path. |
| Sewing start date | The date sewing begins, which follows directly once cutting and any needed fabric preparation are complete. |
A forward critical path starts at confirmation and adds each stage's own length to find a warehouse-arrival date. Backward scheduling reverses this: it starts at a fixed in-store date and subtracts each stage's own length, in the same order but running the other way, until the date left over is the cut date. The cut date this method produces is a limit: cutting any later than that date makes the fixed in-store date impossible to meet using the same stage lengths.
| What can differ | The shapes you meet | Why it matters |
|---|---|---|
| Export vs. domestic order | An export order such as Fairway Stores' jeans subtracts shipping weeks and retail-side days before reaching a factory's own calendar; a domestic order subtracts a shorter local delivery stretch, landing on a later cut date for the same in-store date. | Applying an export order's own longer backward subtraction to a domestic order pushes its cut date earlier than the domestic order actually needs. |
| MTO vs. MTS vs. hybrid | A Make to Order cut date is calculated once, from one confirmed order's own in-store date; a Make to Stock cut date repeats every reorder cycle against a recurring delivery date; a hybrid account calculates both kinds of cut date for the same buyer. | Calculating only one cut date for an MTS account misses that each reorder cycle has its own in-store date and therefore its own cut date. |
| Who confirms the in-store date | A brand such as Northline Apparel sets the in-store date with its own retail customer, Fairway Stores, then passes the resulting cut date to Delta Garments; the factory itself does not set the in-store date. | A factory that treats the cut date as its own choice, rather than a limit passed down from the buyer's own in-store date, can plan a later start than the schedule actually allows. |
| A short factory critical path vs. a longer one | Order B's jeans, with washing, subtracts more stage lengths before reaching a cut date than a shorter order without a washing stage would. | Skipping a stage's own lead time in the backward calculation, such as washing, produces a cut date that is later than the true limit. |
| Socks, terry and home-textile product families | A hosiery order subtracts linking and boarding time in place of sewing and washing; a home-textile order subtracts its own cut-and-sew time for a multi-piece set. | The backward-scheduling method is the same across product families; only which stage lengths are subtracted changes. |
Fairway Stores wants Order B's jeans floor-ready by week 23, the date fixed in Lesson 1 of this course from Northline Apparel's own week-22 warehouse arrival plus one illustrative week of retail-side processing. Northline Apparel passes this same week-23 target back to Delta Garments as the date its own critical path must support. Karim, the production manager, does not start from confirmation and hope the schedule works; he starts from week 23 and subtracts the jeans order's own fixed stage lengths, one at a time, in reverse order, until he reaches the date cutting must start.
The worked numberKarim works through the jeans order's own fixed stage lengths in the same reverse order the schedule actually runs:
Week 10 is the same week the jeans order's own fixed forward schedule already gives for fabric in-house, since backward scheduling on a fixed set of stage lengths always returns to the same date the forward schedule would produce. Cutting cannot start until fabric is in-house, so week 10 is the latest date cutting can begin without missing the week-23 floor-ready target.
A common mistake is a factory accepting a buyer's fixed in-store date without working backward first, then discovering later that the calculated cut date is earlier than the date the order was even confirmed. If Karim agreed to Order B's jeans week-23 floor-ready date without this backward calculation, and confirmation only happened in week 2, he would have no way of knowing in advance that a week-10 cut date left too little room for approvals and fabric sourcing to finish first. Running the backward calculation before agreeing to the date is what lets a factory refuse, or renegotiate, a date it cannot actually meet.
A buyer usually cares about one date: when goods are ready to sell in a store. A factory needs many dates leading up to that one. Working backward means starting from the buyer's one date and taking away the time each step needs, one step at a time, until you reach the day cutting must start. If that day has already passed, the schedule cannot work as planned, and this is worth knowing before agreeing to the date, not after.
Fairway Stores asks Northline Apparel whether Order B's jeans can be floor-ready by week 22 instead of week 23, one week earlier than originally planned.
The relevant note from Northline Apparel's own request:
Can Delta Garments accept the week-22 target without any other change? Decide before you open the decision.
No, not without also moving fabric in-house earlier, since the backward calculation puts the new cut date at week 9, one week before fabric is due in-house at week 10.
The two facts that decide this are that the new target shifts every backward-calculated date one week earlier, including the cut date, and that fabric in-house is the jeans order's own fixed week-10 milestone that this request does not change. Cutting cannot start before fabric is in-house, so a week-9 cut date is not physically possible while fabric still arrives in week 10. Delta Garments can only accept the week-22 target if fabric in-house is also moved to week 9 or earlier, a separate change Karim would need to raise with Northline Apparel before agreeing to the new date.
Order B's jeans total FOB value is fixed by its price and quantity:
If Karim agreed to the week-22 target without running the backward calculation, Delta Garments could promise a date it cannot meet, since cutting would need to start before fabric is even in-house. Discovering this only once cutting fails to start on time, rather than during the request itself, risks every later milestone on the same 22-week critical path, and the sea freight booking for the whole USD 29,400 order. Running the backward calculation before answering the request is what lets Karim give an accurate answer instead of a guess.
Use the T19-C03 Retail critical-path tracker. For Order B's jeans, record the fixed in-store date, then work backward through each stage's own known length to fill in the calculated date for every earlier milestone, ending with the cut date. Leave the status field open for later lessons to update.
[Download the Retail critical-path tracker](../../templates/T19-C03-retail-critical-path-tracker.xlsx)
1. What does working backward from an in-store date produce?
2. A buyer sets a floor-ready target of week 20 for an order whose stages after cutting total 10 weeks. What is the latest cut date?
3. A backward calculation puts a cut date one week before fabric is due to arrive in-house. What should the factory do?
| EN | AR | FR | TR | Meaning |
|---|---|---|---|---|
| In-store date | تاريخ التوفر في المتجر | Date de mise en magasin | Mağazada bulunma tarihi | The fixed date a buyer wants goods physically ready for sale on a store's own selling floor. |
| Cut date | تاريخ بدء القص | Date de coupe | Kesim tarihi | The latest date a factory can start cutting fabric and still meet a fixed in-store date. |
| Backward scheduling | الجدولة العكسية | Planification rétroactive | Geriye doğru planlama | Starting from a fixed end date and subtracting each stage's own known length, in order, to find an earlier date. |
| Stage duration | مدة المرحلة | Durée de l'étape | Aşama süresi | The fixed number of days or weeks a single stage takes from its own start to its own finish. |
| Confirmation date | تاريخ التأكيد | Date de confirmation | Onay tarihi | The date a buyer and a factory agree an order, the starting point of the factory's own critical path. |
| Sewing start date | تاريخ بدء الخياطة | Date de début de la couture | Dikim başlangıç tarihi | The date sewing begins, which follows directly once cutting and any needed fabric preparation are complete. |
Next you will learn how a buying office keeps one critical-path board across several style lines and several factories at the same time, instead of tracking each one separately. Back to the course map