Comparison of spt to edd multiple dimension rules job

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Comparison of SPT to EDD Multiple-dimension rules Job Shop Dispatching:which job to process next. Major priority sequencing rules: Critical Ratio (CR) Slack per remaining operation (S/RO) Earliest due date (EDD) First come, first served (FCFS) Shortest processing time (SPT) Overall Performance Comparison SPT has lower work-in-process and lower average flow times EDD has lower average hours past due and lower maximum hours past due
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General performance of Job Sequencing Heuristics 1.First come - first served: poor performance and fair play. 2.Shortest Processing Time: good performance and may continuously push the long processing time orders way back. 3.Critical ratio: good performance and focuses too much on jobs that cannot be completed on time.
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Scheduling in Service Operations Major characteristics of scheduling in service operations: Large demand fluctuation due to customer involvement Intangible output can not be inventoried, capacity flexibility is critical Capacity is labor-intensive in customer-contact operations
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Scheduling in Service Operations (II) Two major scheduling issues: Worker shift construction: how many shifts per working day? Staffing for each shift: how many workers will be assigned to each shift? Major scheduling techniques in service operations: Optimization analytical models Practical-oriented scheduling heuristics Queuing models Computer simulation search algorithms
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Scheduling in Service Operations (III) Scheduling customer demand Appointments Reservations Backlogs Scheduling the workforce Translates the staffing plan into specific schedules of work for each employee Must satisfy workforce requirements Must reallocate employees if requirements change Major Scheduling Constraints Technical constraints Legal and behavioral considerations Schedule types fixed and rotating
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Scheduling in Service Operations (IV) Computerized workforce scheduling systems Useful in coping with complex systems 24/7 schedules and the need for great flexibility add significantly to the complexity of scheduling Scheduling across the organization Schedule involves an enormous amount of detail and affect every process in the firm Product, services, and employees schedule determine specific cash flow requirements, trigger the billing process, and may initiate requirements for employee training processes Good scheduling processes can decrease costs and improve responsiveness to supply-chain dynamics The scheduling process, whether it is in manufacturing or services, can provide any firm with a capability useful in competing successfully
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Scheduling Services Scheduling Services Day Day M M T T W W Th Th F F S S Su Su Employee Employee 1 1 X X X X X X X X X X off off off off Employee Employee 2 2 X X X X X X X X X X off off off off Employee Employee 3 3 X X X X X X X X X X off off off off Employee Employee 4 4 off off off off X X X X X X X X X X Employee Employee 5 5 X X X X X X X X X X off off off off Employee Employee 6 6 off off off off X X X X X X X X X X Employee Employee 7 7 X X X X X X X X X X off off off off Employee Employee 8 8 X X X
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