Example 15.1 Daily Scheduling of Postal Employees Workforce Scheduling Models.
Chapter 16 & 9 Scheduling Work & Employees. Scheduling Outline What needs to be scheduled?...
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Transcript of Chapter 16 & 9 Scheduling Work & Employees. Scheduling Outline What needs to be scheduled?...
Chapter 16 & 9
SchedulingWork & Employees
SchedulingOutline
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
Shop floor control includes:
1. assigning a priority to each order2. issuing dispatching lists to each work center
(what and when to produce)3. keeping WIP inventory updated4. providing input-output control for all work
centers5. monitoring efficiency, utilization, and
productivity of workers and machines
Scheduling (Dispatching/Sequencing) Rules
FCFS – First Come, First ServedSPT – Shortest Processing TimeEDD – Earliest Due DateLeast 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
Scheduling Rules Example
Job # Due Date Remaining Lead Time
Time Until Due Date Slack CR
768 58 4
775 65 12
751 61 7
758 56 8
763 69 14
currently day 50; 5 jobs at a machine
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
Gantt ChartFCFS: 34, 35, 36, 37
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
34 35 36 37
34
34
35
35
36
36
37
37C
B
A 15 weeks
Gantt ChartSPT: 37, 35, 36, 34
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
3435 3637
34
34
35
35
36
36
37
37C
B
A 11 weeks
Work-Shift Scheduling Rule(work 5 days, 2 consecutive days off)
Sun Mon Tue Wed Thu Fri Sat
2 5 3 4 2 4 5
Minimum # ofemployeesneeded
Work-Shift Scheduling Rule(work 5 days, any 2 days off)
Sun Mon Tue Wed Thu Fri Sat
2 5 3 4 2 4 5
Minimum # ofemployeesneeded
Work-Shift Scheduling Rule(work 4 days, 3 consecutive days off)
Sun Mon Tue Wed Thu Fri Sat
2 5 3 4 2 4 5
Minimum # ofemployeesneeded