1. Scheduling

2. Characteristics of a “job” Constituent operations Constituent operations Due date Due date Time of arrival in shop Time of arrival in shop Starting time Starting time Completion time Completion time Flow time Flow time Lateness Lateness

3. Characteristics of a schedule Two basic types of scheduling Work-force scheduling Work-force scheduling Operations scheduling Operations scheduling

4. Operations Scheduling short-term plans designed to implement the master production schedule job shop job shop flow shop flow shop

5. Timing of job/operations scheduled (Gantt chart) Job or activity progress chart Job or activity progress chart Machine chart Machine chart For n jobs, each requiring m machines there are (n!) m possible schedules

6. Measures Average flow time of jobs Average flow time of jobs Average lateness of jobs Average lateness of jobs Makespan Makespan Idle time Idle time Past Due Past Due WIP WIP Utilization Utilization Which of these would Goldratt have said was best?

7. Scheduling heuristics FCFS – first come, first served FCFS – first come, first served SPT – shortest processing time SPT – shortest processing time EDD – earliest due date EDD – earliest due date

8. Information Needed for Scheduling Question: What information do you feel is needed to accurately schedule an operation? Question: What information do you feel is needed to accurately schedule an operation?

9. Scheduling Class Activity At the beginning: 400 birch in inventory 100 cherry past due Equipment is set up for cherry

10. Scheduling Game Process. I will give you demand for week I will give you demand for week Decide on how much of each type to process – don’t forget open orders & birch forecast! Decide on how much of each type to process – don’t forget open orders & birch forecast! Record on decision log Record on decision log Make a feasible schedule (don’t forget setups) Make a feasible schedule (don’t forget setups) Turn in decision for week to me Turn in decision for week to me When complete wait for actual birch demand for week When complete wait for actual birch demand for week Calculate profit/loss – give total to me Calculate profit/loss – give total to me Get demand for new week Get demand for new week