ch is of potential use in deciding which products to consider for the forward area. Hackman and Rosenblatt [12] present a model where order-picking from the reserve area is possible. Accordingly, the question arises which products should be picked from the forward area and how much space must be allocated to each of these products. The objective is to minimize the total costs for order-picking and replenishing. The authors assume that one replenishment trip su?ces to replenish a product, irrespective of the allocated quantity. The authors derive analytic expressions for the optimal product quantities as a function of the available storage space. They present a knapsack-based heuristic that assigns these quantities to the forward area in sequence of decreasing cost savings until it is full.
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