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dispatching rules


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Rules used to decide the priorities for fulfilling orders. Examples include:first-come-first-served (FCFS);first-in-first-out (FIFO) – often seen as a fair rule, especially by the customer, but in practice it leads to overall inefficiency;earliest-due-date (EDD) first – the job due out first is processed first: this ignores arrival times and processing times;shortest processing time (SPT) first – an ideal method for getting small jobs out of the way and minimizing work in progress, but it can make large jobs late and it ignores due dates and arrival times;longest processing time (LPT) first – this tends to increase work in progress and to make short jobs late;truncated shortest processing time (TSPT) – jobs that have been waiting longer than a predetermined time are given priority (if no work has been waiting long, SPT rules apply);critical ratio (CR) – this is the ratio of the time until the due date to the processing time: jobs with the lowest CR are processed first.

first-come-first-served (FCFS);

first-in-first-out (FIFO) – often seen as a fair rule, especially by the customer, but in practice it leads to overall inefficiency;

earliest-due-date (EDD) first – the job due out first is processed first: this ignores arrival times and processing times;

shortest processing time (SPT) first – an ideal method for getting small jobs out of the way and minimizing work in progress, but it can make large jobs late and it ignores due dates and arrival times;

longest processing time (LPT) first – this tends to increase work in progress and to make short jobs late;

truncated shortest processing time (TSPT) – jobs that have been waiting longer than a predetermined time are given priority (if no work has been waiting long, SPT rules apply);

critical ratio (CR) – this is the ratio of the time until the due date to the processing time: jobs with the lowest CR are processed first.

Subjects: Business and Management.


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