Points clés
- Work backwards from required-on-site date through the full lead-time chain.
- Include origin holidays, inspection lead times and document issuance time.
- Mark decision dates, not only delivery dates.
Backward planning
Required-on-site date minus inland transit, discharge and clearance, ocean transit, loading window, production lead time, contracting time and qualification time. The result is the decision date — the point after which the option set narrows.
The dates buyers forget
Origin-country public holidays, factory maintenance shutdowns, pre-shipment inspection scheduling, certificate issuance and legalisation time, and destination-port congestion peaks. Each can add material time without any party being at fault.
Building the review rhythm
A calendar is only useful if it is reviewed on a fixed cadence against actual stock, actual arrivals and forecast changes. Monthly review with weekly exception tracking is a common and workable pattern.
À vérifier
- Full lead-time chain documented per ingredient and origin
- Origin and destination holiday calendars included
- Decision dates flagged separately from delivery dates
Risques à maîtriser
- Purchase decisions forced by stock-out timing rather than market timing
- Certificate or inspection lead time discovered only at the shipping stage
- Arrival clustering caused by uncoordinated ordering
Erreurs fréquentes
- Planning only to the delivery date and ignoring the decision date
- Using a single lead-time figure for all origins
- Failing to update the calendar after a route or supplier change
Questions fréquentes
How much buffer should a calendar carry?
Enough to absorb the normal variation in the longest uncontrolled step, usually ocean transit and clearance. Base it on your own arrival history rather than on quoted transit times.
Should spot purchases be in the calendar?
Yes, as a defined and budgeted exception path with an owner, so that unplanned buying is visible rather than hidden inside normal operations.
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