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Scheduling

Scheduling. Chapter #11. Scheduling. Allocation of resources over time to accomplish specific tasks. Scheduling is done in the short term time horizon i.e. months, weeks or days. Effective and efficient scheduling can be a competitive advantage. Long term. Aggregate Plan.

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Scheduling

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  1. Scheduling Chapter #11

  2. Scheduling • Allocation of resources over time to accomplish specific tasks. • Scheduling is done in the short term time horizon i.e. months, weeks or days. • Effective and efficient scheduling can be a competitive advantage.

  3. Long term Aggregate Plan Determine production capacity Master Production Schedule (MPS) Determine the production schedule for specific products Intermetiate term Different Levels of Planning Strategies and policies External environment Forecast of demand Short term Business Plan Determine the long-term strategies for production and capacity Aggregate planning Master scheduling Material Requirements Planning (MRP) Determine the needs for components and raw materials Detailed planning of orders Scheduling

  4. The Scheduling decisions • What is to be done (Work) • When (Timings) • By whom (Workers) • With what equipment. (Work Stations)

  5. Objectives of Scheduling • High Efficiency • Low cost • Low inventories • Good customer service • Meeting Demand on time

  6. Scope of Scheduling • Scheduling Demand: • Scheduling customers by assigning a specific time for order fulfillment. • Scheduling Workforce: • Scheduling that determines when employees work. • Scheduling Operations: • Scheduling in which jobs are assigned to work stations or employees are assigned to jobs for specific time periods.

  7. Due Date Due Date Now Now Scheduling Approaches Forward Scheduling • The scheduler selects a planned order release date and schedules all activities from this point forward in time. • Produces a schedule though it may not meet due date. • Backward Scheduling • Begins with the due date and schedules • the final operation first . Schedule is produced • by working backwards though the processes

  8. Scheduling Techniques • LOADING / DISPATCHING: • Involves assigning jobs to work centers and to various machines in the work centers • SEQUENCING: • Sequencing is concerned with determining the order in which jobs are processed

  9. Priority Sequencing Rules • Random • FCFS • EDD • SPT (Shortest Processing Time) • LWR (Least work Remaining) • FOR (Fewest operation Remaining) • ST (Slack Time)

  10. GANTT Chart • Gantt charts are named for Henry Gantt, a management pioneer of the early 1900s. • He proposed the use of a visual aid for loading and scheduling operations. • Most commonly used scheduling tool in the world.

  11. Current date Job 4/17 4/18 4/19 4/20 4/21 4/22 4/23 4/24 4/25 4/26 Ford Nissan Pontiac GANTT Chart (Example) Start activity Finish activity Scheduled activity time Actual progress Nonproductive time

  12. Time 12 pm 7am 8am 9am 10am 11am 1pm 2pm 3pm 4pm 5pm 6pm Workstation Operating Room A Dr. Jon Adams Dr. Aubrey Brothers Dr. Alaina Bright Operating Room B Dr. Jeff Dow Dr. Gary Case Dr. Madeline Easton Operating Room C Dr. Jordanne Flowers Dr. Dan Gillespie GANTT Chart (Example) Figure 14.8 – Gantt Workstation Chart for Operating Rooms at a Hospital

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