Production planning is a cycle of five steps rather than a single schedule, and the two steps most programmes skip are the ones that protect the date: checking the plan against capacity, and routing every change through one channel. A plan that is not checked against capacity is a wish with dates on it.
Production planning: the five steps of the cycle
Freeze the forecast window, book the slot and the materials, confirm the milestones, check the plan against capacity, and channel the change requests.
The cycle repeats as the order approaches: the freeze happens once, the bookings are confirmed as they are made, and the last two steps run continuously. Treating the cycle as a loop rather than a document is what allows a plan to absorb a change in one place instead of everywhere.
Each step produces a record, and the records are what make the next order faster. A programme that plans without recording the slot, the bookings and the changes re-learns the same facts on every order.
Step 1: freeze the forecast window
A forecast is useful only when it has a boundary.
Freezing the next window — typically a quarter, split into monthly quantities — allows the factory to place material orders and book slots against a defined quantity rather than against an intention. Quantities beyond the window stay flexible and are handled in the next cycle. The record is a dated statement of the window and its monthly split, which is also what the capacity check uses.
Step 2: book the slot and the materials
Two bookings that determine the calendar.
The slot is booked with a line, a week and a shift pattern; the materials are covered either by the factory’s stock for a production platform or by purchase orders for configuration-specific parts. The record for each is the confirmation, with the date it was given. Where either is left as an estimate, the lead time is a description rather than a plan.
Step 3: confirm the milestones
The plan is converted from durations into dates.
Sample approval, artwork approval, deposit, production start, completion, inspection, freight booking and delivery each get a date and an owner. The buyer’s own milestones belong on the same page, because they start clocks on the supplier’s side. The output is a one-page schedule that both sides work from, and it is revised rather than replaced when something moves.
Step 4: check the plan against capacity
The step that turns a schedule into a feasible one.
Compare the monthly quantities in the frozen window against the line rate for the configuration, the shifts planned for those months and the share already committed. Where the plan exceeds the remaining capacity, the choices are to move volume earlier, to split it across two slots or to accept a later date. Discovering the gap here costs an email; discovering it after the material orders are placed costs the launch.
Step 5: manage the change requests in one channel
One log, one owner and one priced note per change.
Changes arrive from several directions: a packaging amendment, an added market, a component substitution, a quantity adjustment. Each affects the price or the calendar, and the only way to keep the plan honest is a single log where every request is recorded, priced and dated, with the effect on the schedule shown. Requests made in conversation are the ones that appear on the invoice later.
| Step | Record it produces | Who owns it | What it prevents |
|---|---|---|---|
| Forecast freeze | A dated window with a monthly split | The buyer | Material ordered against an intention |
| Booking | Slot and material confirmations | Both parties | A timeline made of durations |
| Milestones | A one-page dated schedule | Both parties | Unannounced buyer-side slips |
| Capacity check | The plan against the line rate and loading | Both parties | A feasible-looking impossible plan |
| Change log | Priced notes with schedule effects | One named owner | Surprises at the invoice |
Running the cycle as a rhythm
Two meetings a quarter and one page of output.
The first meeting freezes the window and books the slot; the second reviews the capacity check and closes the change log. Between them, the milestone page is updated as dates are confirmed. A rhythm of this size is small enough to be maintained during a busy quarter, which is the property that makes it useful rather than aspirational.
The records that make the next cycle faster
Four records carry the learning from one cycle to the next.
The frozen window and its actual outcome; the slot confirmations with their dates; the capacity answers with their dates; and the change log with its priced notes. Together they show how accurate the forecast was and which changes were worth making, which is the input to the next freeze. A cycle that keeps no records repeats the same corrections every quarter.
FAQ
How long should a forecast window be?
A quarter split into monthly quantities is a practical default for this category, long enough for material and slot booking and short enough to be revised. Longer windows are useful as a direction and should not be used to place purchase orders. A quarter split into monthly quantities is long enough for material and slot booking and short enough to be revised.
Who should own the change log?
One named person on the buyer’s side and one on the supplier’s, with every request recorded in the same place. A log with two owners and no single record is a conversation, and conversations are remembered differently. Name one person on the buyer’s side and one on the supplier’s with every request recorded in the same place, because two owners and no record is a conversation.
What if the capacity check fails?
Move some volume earlier, split the order across two slots, or accept a later date. The decision belongs before the material orders are placed, because after that the cost of changing the plan includes components already bought. Move some volume earlier, split the order across two slots, or accept a later date, and decide before the material orders are placed.
Does this work for a small programme?
The steps reduce in scale rather than in kind: a single page with a slot, dates and a change list. Small programmes benefit most from the capacity check, because they have the least leverage when a slot moves. The steps reduce in scale rather than in kind: a single page with a slot, dates and a change list, and small programmes benefit most from the capacity check.
How is the plan revised when a date moves?
Re-derive the milestone page from the new date and re-check capacity, rather than carrying the original schedule forward with a note. Carrying it forward is how two conflicting versions of the same plan end up in circulation. Re-derive the milestone page from the new date and re-check the capacity, because carrying the original forward produces two conflicting versions of the same plan.
Next step
Send the configuration, the quarterly quantities and the target launch to Wecent Group through the contact page. The reply returns the slot and material confirmations, the dated milestone page and the capacity position for the frozen window. Related reading: our charger factory, OEM and ODM charger manufacturing and charger manufacturing services. External references: ICC Incoterms rules, International Trade Centre Trade Map, IEC standards, BSI ISO 9001 quality management, UL standards and certification and Intertek testing services.
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