Term
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Definition
| The operations to be performed, their sequence, the work centers visited, & the time standards |
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Term
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Definition
| A resource whose capacity is less than the demand place on it |
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Term
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Definition
| The time that a job can be delayed & still finished by its due date |
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Term
| What are two characteristics of High Volume Operations |
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Definition
| Generally have fixed routings Bottlenecks are easily identified |
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Term
| What are the characteristics of Low Volume Operations |
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Definition
| Job shop operations are designed for flexibility Each product or service may have its own routing Bottlenecks move around depending on the products being produced |
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Term
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Definition
| Graphical tools used to illustrate workloads & help monitor job progress |
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Term
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Definition
| illustrates the workload relative to the capacity of a resource |
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Term
| Gantt Charts - Progress charts |
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Definition
| Illustrates the planned schedule compared to actual performance |
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Term
| What is the Load chart used for |
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Definition
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Term
| What are Progress Charts used for? |
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Definition
| Job status planned activity vs. actual activity |
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Term
| What is infinite loading? |
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Definition
| Ignores capacity constraints, but helps identify bottlenecks in a proposed schedule Also enables proactive management |
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Term
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Definition
| Allow only as much work to be assigned as a station should be able to handle - but doesn't prepare for the inevitable slippage |
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Term
| What are the common priority rules? |
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Definition
| First come first served Last come, first served Earliest due date Shortest processing time Longest processing time |
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Term
| What is the critical ratio equation? |
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Definition
| (Time until due date)/(processing time) |
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Term
| What is another equation for common priority rules? |
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Definition
| Slack/(number of remaining operations) |
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Term
| What is the Johnson's Rule? |
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Definition
| Technique for minimizing completion time for a group of jobs to be processed on two machines or at two work centers |
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Term
| What are the two benefits of the Johnson's Rule? |
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Definition
| Minimize total idle time Several conditions must be satisfied |
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Term
| What are the necessary conditions for the Johnson's rule? |
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Definition
| Job time must be known and constant for each job -Job times must be independent - Job must follow same two-step sequence - Job priorities cannot be used - Units must be completed at first work center before moving to second work center |
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Term
| What is the Optimum sequence for Johnson's Rule? |
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Definition
| 1. List the jobs and their times and each work center 2. Select a job with the shortest time -if the shortest time is at the first work center, schedule that job first - If the shortest time is at the second work center, schedule the job last -Break ties arbitrarily 3. Eliminate the job from further consideration 4. Repeat steps 2 and 3 working toward the center of the sequence until all jobs have been scheduled |
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Term
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Definition
| Quantity of finished goods ready to sell |
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Term
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Definition
| Quantity produced at a resource before switching to another product |
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Term
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Definition
| Quantity routed at one time from one resource to the next |
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Term
| What does Optimized Production Technology do? |
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Definition
| focuses on bottlenecks for scheduling & capacity planning |
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Term
| What does The Theory of Constraints do? |
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Definition
| Extends OPT to consider multiple constraints 1. Internal resource constraints 2. Market Constraints 3. Policy constraints |
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Term
| What is the TOC procedure? |
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Definition
| 1.ID the bottlenecks 2.Fully utilize the bottlenecks 3.Schedule non-bottlenecks to support maximum use of bottleneck activities 4.Consider adding capacity at the bottleneck 5.Continually check for new bottlenecks |
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Term
| What are two type of service issues? |
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Definition
| 1.Demand Management 2. Managing service capacity |
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Term
| Ways to deal with demand management? |
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Definition
| 1. appointments & reservations 2. posted availability 3. Delayed services or backlogs |
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Term
| What the the ways to manage service capacity? |
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Definition
| 1.Staff for peak demand 2.Floating employees or employees on call 3.Temporary, seasonal, or part-time employees |
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Term
| what are the types of inventory? |
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Definition
| 1.Raw materials 2.Components 3.Work-in-progress 4.Finished goods 5.Distribution inventory 6.Maintenance, repair & operating supplies |
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Term
| What are the different uses of inventory? |
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Definition
| 1.Anticipation or seasonal 2.Safety stock: buffer demand fluctuations 3.Lot-size or cycle stock: take advantage of quantity discounts 4.Pipeline or transportation inventory 5.Speculative or hedge inventory 6.Maintenance, repair, and operating inventory (MRO) |
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Term
| What are the objectives for proper inventory management? |
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Definition
| 1.Provide desired customer service level 2.Provide for cost-efficient operations 3.Minimize inventory related investments |
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Term
| What are the Inventory costs? |
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Definition
| 1.Item price 2.Holding costs 3.Ordering & setup costs 4.shortage costs |
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Term
| What does ABC Classification mean? |
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Definition
| Divide inventories into three different categories based on value, risk, & other considerations |
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Term
| How do you review inventories in the A category? |
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Definition
| Use tight controls & frequent reviews |
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Term
| How do you divide inventory into B category? |
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Definition
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Term
| How do you divide inventories into C categories? |
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Definition
| use simple, inexpensive systems with large safety stocks to manage C items |
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Term
| What does PERT stand for? |
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Definition
| Program Evaluation and Review Technique Developed to handle uncertain activity times |
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Term
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Definition
| Critical Path Method. Developed for industrial projects for which activity times generally were known |
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Term
| Where did PERT come from? |
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Definition
| Developed by the U.S. Navy for Polaris missile project |
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Term
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Definition
| Developed by DU Pont & Remington Rand |
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