Optimized Production Planning The most prevalent approach in the production planning is based on the concept of material requirement planning (MRP). √ The release time is obtained by shifting the expected output time back along the time scale by a period of the estimated average lead time; The release quantity is derived by dividing the expected output by the estimated average product yield. 上浒充通大粤Optimized Production Planning The most prevalent approach in the production planning is based on the concept of material requirement planning (MRP).  The release time is obtained by shifting the expected output time back along the time scale by a period of the estimated average lead time;  The release quantity is derived by dividing the expected output by the estimated average product yield