A production schedule can be checked in four questions, and a schedule that answers all four is short. A schedule that answers none of them contains the same durations as the one beside it and no dates, which is why two departments can hold two versions of the same plan without noticing.
Charger production schedule: what the document should show
Four items: dates rather than durations, the steps that are queued, the buyer’s own milestones, and the record of what has changed.
The four are diagnostic: each one, in its absence, predicts a specific kind of slip. Durations without dates slip silently, queued steps without booking slip by a queue position, missing buyer milestones slip on approval, and no change record slips twice.
Reading the schedule this way takes a few minutes and it is the difference between accepting a plan and accepting a description of one.
Item 1: dates rather than durations
A date can be checked; a duration can only be believed.
Every step should carry a start and an end date derived from the launch date, not a number of days. Where a step is described as “about ten days”, there is no way to see whether it has started, whether it overlaps with the next step or whether it has already moved. Converting the durations into dates is the first act of planning rather than the last.
Item 2: which steps are queued
Queues are shortened by booking, and only if they are visible.
The tool shop, the laboratory, the printer and the freight booking are all queues with dates attached. A schedule that shows the production step but not the queue that precedes it hides where the real risk sits. Marking each step as fixed or queued is enough to see which one can be compressed by an early booking and which cannot be compressed at all.
Item 3: the buyer’s own milestones
Sample approval, artwork approval and deposit payment.
Each of the three starts a clock on the supplier’s side, and all three belong on the same page as the supplier’s steps. A schedule that shows only the factory’s work invites the assumption that the buyer’s decisions are instantaneous. In practice the approval date is the milestone most often missed, and it is the one the buyer can control.
Item 4: the change record
A schedule that is revised without a record becomes two schedules.
Each revision should carry the date, the reason and the steps affected, so that the current version is identifiable and the previous one is closed. Where changes are conveyed by email and applied to a spreadsheet, two parties can hold two versions of the same plan and both believe they are current.
| Item | What it looks like when present | What its absence predicts | Who fixes it |
|---|---|---|---|
| Dates | Start and end dates per step | A silent slip | Whoever holds the plan |
| Queues marked | Fixed and queued steps distinguished | A queue-position slip | The factory and the buyer |
| Buyer milestones | Approval and payment dates on the page | An approval slip | The buyer |
| Change record | A dated revision note per change | Two plans in circulation | One named owner |
What actually drives the calendar
Four drivers, and only one of them is assembly time.
The component lead time, the slot position, the queue for the print or the laboratory, and the freight frequency. Assembly itself is usually the most predictable part of the chain, which is why a schedule built around it looks reasonable and slips anyway. Where the four drivers are shown as dates on one page, the launch risk is visible at the moment the plan is written.
Accepting a schedule
Three conditions before it becomes the working plan.
The dates reconcile with the launch date when counted backwards; the buyer’s milestones appear with the same visibility as the factory’s; and the change record has a named owner on each side. Where a schedule meets those three conditions, it can be reviewed in ten minutes at any point in the programme, which is what makes it a management tool rather than a one-off document.
How the queues are read
A production schedule is a chain of queues rather than a list of dates. The material queue, the tooling queue, the test queue and the packing queue each release work in order, and a change inside one of them moves everything behind it.
That is why a slipped date is re-derived rather than shifted. Moving a single step forward by a week usually produces a second slip at the next queue, and the second slip is the one the buyer notices.
Recording the change history is what makes the plan readable, because it shows where the time went rather than only where it now sits.
FAQ
How often should the schedule be updated?
Whenever a date is confirmed or moved, with the revision recorded. A schedule updated monthly describes last month’s intentions; the useful version is the current one with its change history attached. A schedule updated monthly describes last month’s intentions, so the useful version is current and carries its change history. Keep the change history attached to the current version rather than in a separate note.
Who owns the schedule?
One named person, usually on the factory side, with one counterpart on the buyer’s side. Two owners produce two versions, which is the most common reason a plan drifts without anyone deciding it should. Two owners produce two versions, which is the most common reason a plan drifts without anyone deciding it should. Name both owners in the plan rather than in the correspondence.
Should the buyer’s approval dates be in the factory’s schedule?
Yes, with the name of the person who signs. Those three dates start clocks on the supplier’s side, and leaving them out makes the plan look as though the buyer’s decisions take no time. Leaving the buyer’s approval dates out makes the plan look as though those decisions take no time. Those dates start clocks on the supplier’s side and are as binding as the production dates.
What should be done when a date moves?
Re-derive the plan from the new date and re-check the queues rather than shifting one step. A single step moved inside a queued chain usually produces a second slip at the next queue. A single step moved inside a queued chain usually produces a second slip at the next queue. The re-derived plan also shows which queue absorbed the delay.
Next step
Send the configuration, the launch date and the destination to Wecent Group through the contact page. The reply returns a dated schedule with the queues identified, the buyer’s milestones marked and a single owner on each side. Related reading: our charger factory, OEM and ODM charger manufacturing and charger manufacturing services. External references: ICC Incoterms rules, IEC standards, BSI ISO 9001 quality management, UL standards and certification, International Trade Centre Trade Map and Intertek testing services.
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