Summary form only given. Advanced systems are based on a model ofnthe factory that schedules (and continually reschedules) the use ofnmaterial, machines and people resources to demands and orders placed onnthe factory. Rule-based systems are used to route orders to processes innthe factory, to select material based on current inventory levels andnprocessing alternative, and to select workstations and staff pools fornthe processes. The integrated materials resources planning is tied tonactual factory capacities. This integration insures that the material isnavailable when it can be needed and when it can be used. The advantagenover other systems is that standard MRP2 approaches sometimes requirenraw material to be purchased too early based on standard lead-times; innother cases the standard MRP2 systems can result in later delivery ofnproducts
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