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MINIMUM INVENTORY VARIABILITY POLICY® (MIVP®) |
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Summary explanation: 3 steps to cost and cycle time reduction. MIVP® (US Patent approved November 2004) is a scheduling and release policy (like FIFO, DDF & CR) designed to reduce overall average production cycle time. Average cycle time of all the product mix in production is defined as the summation of all the process times plus the wait time (queue time) at each process step from the raw wafer entering the FAB until it is shipped. MIVP® is specifically designed for semiconductor manufacturing. MIVP® has been proven to work at SEMATECH member companies resulting in average cycle time reductions from 7% up to 33% (savings estimated $21 - $100 plus million per year). MIVP® implementation is done after the following three steps: Step 1: Collection and organization
of all product process flows, step by step, including the process
time, number of wafers in the process step, and equipment data to
calculate theoretical cycle time. Step 2: Preparation of a baseline simulation model of the FAB using existing scheduling policies and/or FIFO policy. Operation of the model for validation, cycle time and WIP data are saved for comparisons. Step 3: Switch existing scheduling policies and/or FIFO with MIVP® policies and rerun the model to demonstrate how MIVP® benefits the reduction in cycle time and WIP data. Once the benefit is seen offline on the simulation model the client can decide to implement MIVP® live in the FAB to obtain improvements.
Click here to go to technical paper that goes with this chart.
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