1. 1 Slides used in class may be different from slides in student pack Chapter 19 Operations Scheduling  Work Center Defined  Typical Scheduling and Control Functions  Job-shop Scheduling  Examples of Scheduling Rules  Shop-floor Control  Principles of Work Center Scheduling  Issues in Scheduling Service Personnel

2. 2 Slides used in class may be different from slides in student pack Work Center Defined  A work center: an area in a business in which productive resources are organized and work is completed.  May be a single machine, a group of machines, or an area where a particular type of work is done.

3. 3 Slides used in class may be different from slides in student pack Capacity and Scheduling  Infinite loading (Example: MRP)  Finite loading  Forward scheduling  Backward scheduling (Example: MRP)

4. 4 Slides used in class may be different from slides in student pack Typical Scheduling and Control Functions  Allocating orders, equipment, and personnel.  Determining the sequence of order performance.  Initiating performance of the scheduled work.  Shop-floor control.

5. 5 Slides used in class may be different from slides in student pack Work-Center Scheduling Objectives     

6. 6 Slides used in class may be different from slides in student pack Priority Rules for Job Sequencing 1. First-come, first-served (FCFS) 2. Shortest operating time (SOT) 3. Last-come, first served (LCFS) 4. Earliest due date first (EDD) Many other possible rules...

7. 7 Slides used in class may be different from slides in student pack Schedule Performance Measures  Meeting due dates  Minimizing the flow time  Minimizing work-in-process  Minimizing idle time

8. 8 Slides used in class may be different from slides in student pack Example of Job Sequencing: First- Come First-Served Jobs (in orderProcessingDue DateFlow Time of arrival)Time (days)(days hence)(days) Answer: FCFS Schedule Suppose you have the four jobs to the right arrive for processing on one machine. What is the FCFS schedule? Late

9. 9 Slides used in class may be different from slides in student pack Example of Job Sequencing: Shortest Operating Time Answer: SOT Schedule Jobs (in orderProcessingDue DateFlow Time of arrival)Time (days)(days hence)(days) Suppose you have the four jobs to the right arrive for processing on one machine. What is the SOT schedule? Late

10. 10 Slides used in class may be different from slides in student pack Example of Job Sequencing: Last-Come First-Served Answer: LCFS Schedule Jobs (in orderProcessingDue DateFlow Time of arrival)Time (days)(days hence)(days) Suppose you have the four jobs to the right arrive for processing on one machine. What is the LCFS schedule? Late

11. 11 Slides used in class may be different from slides in student pack Example of Job Sequencing: Earliest Due Date First Answer: Earliest Due Date First Jobs (in orderProcessingDue DateFlow Time of arrival)Time (days)(days hence)(days) Suppose you have the four jobs to the right arrive for processing on one machine. What is the earliest due date first schedule? Late

12. 12 Slides used in class may be different from slides in student pack Summary

13. 13 Slides used in class may be different from slides in student pack Shop-Floor Control: Major Functions 1. Assigning priority of each shop order. 2. Maintaining work-in-process quantity information. 3. Conveying shop-order status information to the office.

14. 14 Slides used in class may be different from slides in student pack Shop-Floor Control: Major Functions (Continued) 4. Providing actual output data for capacity control purposes. 5. Providing quantity by location by shop order for WIP inventory and accounting purposes. 6. Providing measurement of efficiency, utilization, and productivity of manpower and machines.

15. 15 Slides used in class may be different from slides in student pack Input/Output Control InputOutput  Planned input should never exceed planned output.  Focuses attention on bottleneck work centers. Work Center

16. 16 Slides used in class may be different from slides in student pack Principles of Work Center Scheduling 1. 2. 3. 4.

17. 17 Slides used in class may be different from slides in student pack Principles of Job Shop Scheduling (Continued) 5. 6. 7. 8.

18. 18 Slides used in class may be different from slides in student pack Principles of Job Shop Scheduling (Continued) 9. 10.

19. 19 Slides used in class may be different from slides in student pack Personnel Scheduling in Services  Scheduling consecutive days off  Scheduling daily work times  Scheduling hourly work times