op management chapter 6

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op management chapter 6
2010-10-30 16:24:34
operations management chapter

operations management chapter 6 vocab
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  1. Process
    is any part of an organization that takes inputs and transforms them into outputs
  2. Cycle time
    is the average successive time between completions of successive units
  3. utilization
    ratio of the time that a resource is actually activated relative to the time that it is available for use
  4. process flowcharting
    is the use of a diagram to present the major elements of a process
  5. rectangle
    taks or operations
  6. diamond
    decision points
  7. triangle
    storage areas or queues
  8. arrows
    flow sof materials or customers
  9. buffer
    a storage area between stages where the output of a stage is placed prior to being used in a downstream stage
  10. blocking (can occur with no buffering)
    occurs when the activities in a stage must stop because there is no place to deposit the item just completed- employee has to stop working and hold onto the unit
  11. starving (can occur with no buffering)
    occurs when activities in a stage must stop because there is no work; employee stops working bc no work is coming their way
  12. bottleneck
    when the limited capacity of a process causes work to pile up or become unevenly distribute in the flow of a process
  13. pacing
    refers to the fixed timing of the movement of items through the process (assembly lines)
  14. make-to-order
    only activated in response to an actual order; both work-in-process and finished goods inventory kept to a min
  15. make-to-stock
    process activated to meet expected or forecast demand; customer orders are served from target stocking level
  16. process throughput time reduction
    perform activities in parallel, change the sequence of activities, reduce interruptions
  17. hybrid
    combination of make-to-stock and make-to-order
  18. operation time
    the sum of the setup time and the run time for a batch of parts that are run
  19. run time
    time required to produce a batch of parts
  20. set up time
    the time required to prepare to make a particular item
  21. throughput time
    average time that it takes a unit to move through the entire process (lead time)
  22. productivity
    ratio of output to input
  23. efficiency
    ratio of the actual output of a process relative to some standard
  24. throughput rate
    the output rate the process is expected to produce for a given period of time
  25. process velocity or throughput ratio
    ratio of the total throughput time to the time value is being added
  26. value added time
    the time in which useful work is actually being done on the unit
  27. little's law
    throughput time is = to work-in-process / throughput rate