Discusses the models for determining Economic Order Quantities (EOQs) for items in a multi?item situation with constraints. The derivation of EOQs for items under the constraint of average total investment in inventories is given. The EOQs for items where there is a constraint on total workload (i.e., number of orders per annum) is also derived. The characteristics of optimal solution are discussed; the optimal policy curve is derived and its uses explained. An example is used to illustrate the derivations of EOQs under these constraints and to highlight the use of the optimal policy curve.