1. Chapter 16 & 9 Scheduling Work & Employees

2. Scheduling Outline What needs to be scheduled? –doctor’s office, restaurant, mfg. plant, hospital –employees vs. products Gantt charts Dispatching (sequencing) rules for scheduling work Scheduling employees

3. Shop floor control includes: 1.assigning a priority to each order 2.issuing dispatching lists to each work center (what and when to produce) 3.keeping WIP inventory updated 4.providing input-output control for all work centers 5.monitoring efficiency, utilization, and productivity of workers and machines

4. Scheduling (Dispatching/Sequencing) Rules FCFS – First Come, First Served SPT – Shortest Processing Time EDD – Earliest Due Date Least Slack (LS) slack = (time until due date) – (remaining lead time)  process job with smallest slack first Critical Ratio (CR) CR = (time until due date) / (remaining lead time)  process job with smallest CR first

5. Scheduling Rules Example Job #Due Date Remaining Lead Time Time Until Due Date SlackCR 768584 7756512 751617 758568 7636914 currently day 50; 5 jobs at a machine

6. Gantt Chart weeks of processing time work order # mach. A mach. B mach. C total 34 4 2 1 35 1 3 1 36 2 2 2 37 1 1 2

7. Gantt Chart FCFS: 34, 35, 36, 37 34 35 3637 34 35 36 37 C B A 15 weeks

8. Gantt Chart SPT: 37, 35, 36, 34 34 35 3637 34 35 36 37 C B A 11 weeks

9. Work-Shift Scheduling Rule ( work 5 days, 2 consecutive days off) SunMonTueWedThuFriSat 2534245 Minimum # of employees needed

10. Work-Shift Scheduling Rule ( work 5 days, any 2 days off) SunMonTueWedThuFriSat 2534245 Minimum # of employees needed

11. Work-Shift Scheduling Rule ( work 4 days, 3 consecutive days off) SunMonTueWedThuFriSat 2534245 Minimum # of employees needed