The APIOBPCS model can be expressed in words as outlined in the previous section. It incorporates three variables:
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Ta, a parameter that describes how quickly demand is tracked in the forecasting mechanism,
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Ti, a parameter that describes of much of the discrepancy between actual inventory and target inventory levels should be added to the production/distribution order rate and
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Tw, a parameter that describes how much of the discrepancy between actual WIP and target WIP levels should be added to the production/distribution order rate.