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Chapter 16

Chapter 16 BU395.docx

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Maryam Hafezi

BU395 Chapter 16 – Job and Staff Scheduling Week 10 Introduction -Job scheduling – establishing the starting and completion hour/date of operations for jobs or orders -Work centre – a production area consisting of one or more workers and machines with similar capabilities, that can be considered as one unit for purpose of scheduling -Shop-floor control – execution of the schedule maintaining, communicating, and monitoring the status of material, orders, ad process; and taking any necessary actions -Backward scheduling – scheduling backward from the due date -Forward scheduling – scheduling ahead, starting from the start date of a job -Staff scheduling – determining the workdays, and start and end times on each workday, for each employee Loading -Loading – the assignment of jobs to work centres and to various machines within each work centre -When making an assignment, managers often choose a work centre of machine that will minimize processing and setup costs, minimize idle time among work centres or machines, allow an operator to run two machines simultaneously, or is the least sophisticated work centre or machine that can do the job depending on the situation Gantt Chart -Gantt chart – a visual aid for loading, scheduling, and control purposes Load/Schedule Gantt Chart -Load/schedule Gantt chart – a Gantt chart that shows the loading and timing of jobs for a resource -Managers may use the load/schedule Gantt chart for trial-and-error schedule development Dealing with Infinite Loading -Infinite loading – jobs are assigned to work centres without regard to the available capacity of the work centres -Finite loading- jobs are assigned to work centres taking into account work centres/ available capacity is and jobs’ processing times Sequencing and Scheduling -Sequencing – determining the order in which jobs will be processed in a work centre or machine Priority Rules and Performance Measures -Priority rules- simple heuristics used to select the order in which jobs will be processed Performance Measures -Job flow time – the length of the time a job is in the shop -Job lateness – the length of time the job completion time/date exceeds the time/date the job was due -Make span – time needed to complete a group of jobs from the beginning of the first job to the completion of the last job -Average WIP – Jobs that are in the shop are considered to be work-in-process inventory Guidelines for Selecting a Priority Rule -SPT is always superior in terms of minimizing average flow time and, hence, average WIP -If all jobs are late, then the SPT rule will always minimize average days late as well -EDD always minimizes the maximum days late BU395 Chapter 16 – Job and Staff Scheduling Week 10 Sequencing Jobs through Two Work Centres/Machines -Johnson’s rule – technique for minimizing make-span for a group of jobs to be processed on two successive work centres/machines -Several conditions must be satisfied: -Job time (setup and processing) must be known for each job as each work centre/machine -Job times must be independent of the job sequence -All jobs must follow the same two-step work sequence -All units in a job must be completed at
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