Abstract: The relationship between finite schedulers which operate on output from a higher level in aconventional MRP Ⅱ system and so-called stand-alone schedulers which essentially operate directly onorders is discussed. Two graphical models-a demand flow model and a flowpipe model-are presented.The growth of the stand-alone scheduler is ascribed to the greatly increased computing power availablequite inexpensively on modern equipment.

Key words: MRPⅡ, FMS, Stand-alone finite schedulers, CRP, RCCP, Demand flow model