Aggregate Plan to Master Schedule

1. Aggregate Plan to Master Schedule AggregatePlanning Disaggregation MasterSchedule Figure 13.4

2. Disaggregating the Aggregate Plan • Master schedule: The result of disaggregating an aggregate plan; shows quantity and timing of specific end items for a scheduled horizon. • Rough-cut capacity planning: Approximate balancing of capacity and demand to test the feasibility of a master schedule.

3. Master Scheduling • Master schedule • Determines quantities needed to meet demand • Interfaces with • Marketing • Capacity planning • Production planning • Distribution planning

4. Master Scheduler • Evaluates impact of new orders • Provides delivery dates for orders • Deals with problems • Production delays • Revising master schedule • Insufficient capacity

5. Master Scheduling Process Figure 13.6 Inputs Outputs Beginning inventory Projected inventory Master Scheduling Forecast Master production schedule Customer orders Uncommitted inventory

6. Projected On-Hand Inventory Projected on-handinventory Inventory fromprevious week Current week’srequirements - =

7. Beginning inventory Forecast is larger than customer orders in week 3 Customer orders are larger than forecast in week 1 Forecast is larger than customer orders in week 2 Projected On-Hand Inventory Figure 13.8

8. Available-To-Promise Inventory • Available-to-promise (ATP) inventory: The quantity of end items that marketing can promise to deliver on specified dates.

10. Time Fences Time Fences: points in time that separate phases of a master schedule planning horizon.

11. Time Fences in MPS Figure 13.12 Period “frozen”(firm orfixed) “liquid”(open) “slushy”somewhatfirm