Mater Production Scheduling (4) Each company may have its Frozen Moderately Flexible own time fences and operating firm rules Frozen:absolutely no change could be made in a firm,or the most minor changes may be allowed in another. Firm customer Moderately firm:some orders changes to specific products within a products group so long as parts are available 8 16 26·1 Weeks Flexible:almost an variations in products are allowable, providing that capacity Figure 4.2 MPS Time Fences remains about the same and that there are no long lead time items involved. 上泽充鱼大粤Mater Production Scheduling (4) 8 16 26 Capacity Frozen Moderately firm Flexible Firm customer orders Weeks Figure 4.2 MPS Time Fences • Each company may have its own time fences and operating rules • Frozen: absolutely no change could be made in a firm, or the most minor changes may be allowed in another. • Moderately firm: some changes to specific products within a products group so long as parts are available ; • Flexible: almost an variations in products are allowable, providing that capacity remains about the same and that there are no long lead time items involved