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Chapter 11. Scheduling Work & Employees. 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. Shop floor control includes:

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chapter 11

Chapter 11

Scheduling

Work & Employees

scheduling outline
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

slide3
Shop floor control includes:
  • assigning a priority to each order
  • issuing dispatching lists to each work center (what and when to produce)
  • keeping WIP inventory updated
  • providing input-output control for all work centers
  • monitoring efficiency, utilization, and productivity of workers and machines
scheduling dispatching sequencing rules
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

scheduling rules example
Scheduling Rules Example

currently day 50; 5 jobs at a machine

gantt chart
Gantt Chart

weeks of processing time

work order #mach. Amach. Bmach. Ctotal

34 4 2 1

35 1 3 1

36 2 2 2

37 1 1 2

gantt chart fcfs 34 35 36 37

34

36

37

A

35

15 weeks

B

34

35

36

37

C

34

35

36

37

Gantt ChartFCFS: 34, 35, 36, 37
gantt chart spt 37 35 36 34

35

37

36

34

A

11 weeks

B

37

35

36

34

C

37

35

36

34

Gantt ChartSPT: 37, 35, 36, 34