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Former Member

MRP and capacity


Just a quick question. Does MRP take into account capacities? I understand MRP is all about ensuring the material availability striking a balance between optimial service and costs. It matches the sales orders (requirements) with stock and generates planned orders or purchase requisitions orstock transfer requisitions based on type of prourement.

But in this flow, does it consider the capacities of it's resources?

Thank you.

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    Former Member
    Apr 03, 2007 at 12:39 AM

    Not in the true sense of the word (assuming you are talking about the generic MRP and not any specific system)

    MRP is just a(n) (information)system to calculate the requirements of dependant demand inventories by ordering and scheduling

    it is supposed to answer the following Q: what is needed, how much is needed,

    and when is it needed

    MRP-I does not have to do with Capacity. But you can give the system a feedback(or close the loop) tor set up constraints that will change this calculation (typically this is done by MRP - II along with a few other things)

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    • Former Member Former Member

      AFAIK Heuristics is not simple MRP but has a lot of rules (as the name indicates) built into it which are feedback to the system to calculate taking into consideration a lot of other factors than just a simple calculation

      So if you run heuristics without any rules and just use it to arrive at just a number for requirement and a date on it and the source of supply it does what MRP is supposed to do

      If you add in capacity levelling and lot sizing and transportation lane constraints and other rules it tends towards being MRP II.

      But if the reading you mentioned here said MRPII is Infinite planning then it probably is not the mainstream understanding of the term.