PICK-FACE PLANNING
How to Set Pick-Face Min, Max, and Replenishment Triggers
Cover demand until the next reliable replenishment, add an explicit buffer, and round to a feasible pack quantity that fits safely.
SHORT ANSWER
The decision in one minute
A pick-face maximum should be the smaller of the demand-driven requirement and safe physical capacity. Set the trigger from demand during replenishment lead time plus a justified buffer, account for open picks and inbound replenishment, and round quantities to the handled pack. Monitor stockouts, emergency moves, and residual stock.
Measure the interval the face must survive
Use order-line or unit demand at the pick-face level, not facility shipments. Define the review cadence, queue delay, travel, reserve retrieval, putaway, and confirmation time. The protection interval ends only when replenished stock is available to pick.
Segment demand by shift and day where peaks matter. A daily average can hide a morning wave larger than the face. Clean promotions, one-time projects, stockouts, and unit-of-measure errors before calculating variability.
Build a demand trigger and physical maximum
A practical trigger begins with expected demand during replenishment lead time plus safety stock for demand and timing variability. Then account for available stock, allocated picks, and replenishments already in progress so duplicate tasks are not released.
Calculate safe face capacity from internal dimensions, orientation, weight, ergonomic limits, and pack quantity. Round down physical capacity and round replenishment quantities to a feasible case or inner pack. Never make a statistical maximum exceed safe capacity.
Choose service and labor tradeoffs explicitly
A larger face reduces replenishment frequency but consumes prime space and can increase travel or dead stock. A smaller face supports denser slotting but creates more touches and risk. Model both pick labor and replenishment labor instead of optimizing one team.
Fast, variable, or critical SKUs may justify more protection or more frequent planned replenishment. Slow movers may need a single case or shared location. Use ABC or velocity classes as review priorities, not as substitutes for SKU-level dimensions and demand.
Close the loop with exception data
Track face stockouts, emergency replenishments, shorts, residual quantity at planned replenishment, replenishment queue time, and touches per picked unit. Investigate whether the cause was bad parameters, reserve inaccuracy, delayed work, or demand change.
Recalculate after slot moves, pack changes, promotions, season changes, or material-handling changes. Keep previous parameters and effective dates so operators can explain why a trigger changed.
A practical workflow
- Clean SKU-level pick demand and choose the peak planning window.
- Measure end-to-end replenishment lead time and its variability.
- Calculate demand during lead time plus an explicit safety buffer.
- Compute safe physical capacity and feasible pack rounding.
- Set min, max, and order quantity with open-demand/open-task logic.
- Pilot, monitor exceptions and labor, then revise with an effective date.