Lesson 9 - Scheduling Flashcards
(13 cards)
Scheduling
Establishing the timing of the use of equipment or other resources, occurs in
every organization. Scheduling decisions are final step before actual output occurs, objective:
trade-off between efficient utilization and minimization of customer waiting time.
Encompasses allocating workload to work centers and determining sequence of work
Success determinants
Process&Product Design, preventive maintenance, rapid repair, optimal product mixes with minimized costs, minimization of quality problems, reliability & timing of supplies
Low-Volume Systems
Systems that handle customized or variable jobs, often with unique requirements
Intermediate-Volume Systems
Systems that periodically switch from one type of job to another, typically producing in batches
High-Volume Systems
Systems that handle large quantities of standardized products using standardized equipment linear flow, e.g. car manufacturing
Gantt Charts
chart used as visual aid for loading/scheduling purposes: organize use
of resources in a time framework (kind of like a classroom schedule) Two Types
Load Chart
depicts loading & idle times1 for a group of machines/depart.
Inifinite loading: assigns jobs without regard to capacity→over(under)loads:
manager needs to find response (shift to other periods, overtime, subcontract) Finite loading: projects actual job starting/stopping times with capacity
For(back)ward scheduling: scheduling ahead/backward from a point in time
Schedule Charts
monitor progress of jobs and whether they are on schedule
Input/Output control
managing workflows and queues at work centers, balance input and output rates, so the center is neither under(over)utilized: stoplights on expressway
on ramps. Report reveals deviations from plan
Job Flow time
time it takes from when job arrives until it’s complete (incl.waiting)
Job lateness
difference between actual completion and due date
Makespan
time needed to complete a group of jobs/I think just processing time
Average number of jobs
Total flow time/makespan