CAPACITY REQUIREMENTS PLANNING

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CAPACITY REQUIREMENTS PLANNING

• CRP Versus RCCP
• Validating The MPS (Really)
• What Good Is MRP Without CRP?

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CORE MRP II
MANUFACTURING RESOURCE PLANNING
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CRP VERSUS RCCP

• RCCP should be used in the initial planning
  stages to weed out egregious master schedules
• Quick feedback
• CRP should be used as a near-final capacity check
  on the master schedules
• More accurate than RCCP
• Formerly considered too time-consuming for
  routine "what-if" analysis
• Increasingly appropriate for what-if analysis
  as computers speed up

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VALIDATING THE MPS (REALLY)

• Considers actual lot-sizing, beginning inventory,
  work-in-process in calculating capacity needs
• Determine incremental run times and setup times
  for each part in each workcenter
• Apply incremental run times and setup times from
  (1) to planned order releases and scheduled
  receipts to determine capacity requirements per
  period for each workcenter

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VALIDATING THE MPS (REALLY)

• Determine incremental run times and setup times
  for each part in each workcenter

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VALIDATING THE MPS (REALLY)

• 2. Apply incremental run times and setup times
  from (1) to planned order releases and scheduled
  receipts to determine capacity requirements per
  period for each workcenter

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VALIDATING THE MPS (REALLY)
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VALIDATING THE MPS (REALLY)
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VALIDATING THE MPS (REALLY)
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VALIDATING THE MPS (REALLY)
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VALIDATING THE MPS (REALLY)
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VALIDATING THE MPS (REALLY)
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WHAT GOOD IS MRP WITHOUT CRP?

• If your MPS is stable
• MRP is being used to generate routine orders
•  You know what your capacity needs will be
  without CRP
• You should probably be using a transactionless
  system (e.g., JIT) anyways
• If your MPS is not stable
• MRP without CRP ("closing the loop") will lead to
  capacity "surprises"