The following typographical errors appeared in our paper "Planning Horizon Procedures for Machine Replacement Models," Management Science, Vol. 25, No. 2 (February 1979), pp. 140-151.

This paper develops rolling horizon procedures for solving a multistage inventory problem with facilities-in-series. In such an inventory system, we assume that the raw material is processed successively through several facilities before reaching the customer. The input to a facility comes from...

This paper develops a "perfect planning horizon procedure" for the simple cash balance problem, where the objective of the firm is to schedule the selling and buying of its earning assets so that all the positive demands are met at minimum cost. Demand for cash can be both positive or negative; a...