Implement the forecasting system. Appraise retrospectively its effectiveness. Combinations of forecasts are good. The author is a pioneer in computer assisted inventory management. Warmdot Company is an extended example throughout.
Forecasts are more accurate for larger groups of items.
Forecasts are more accurate over shorter leadtimes. Peter Drucker, Wall Street Journal, December 1, 1992. A. C. Harvey, A Unified View of Statistical Forecasting Procedures, Journal of Forecasting, Vol. 3, pages 245-275, 1984. 1, pages 111-153, 1982.