This thesis develops and presents a new remanufacturing MRP time-phased scheduling algorithm utilizing a critical path concept, as in the project management field, for incorporation into remanufacturing production planning MRP calculations. The algorithm automates the remanufacturing lead time allowance calculation for child subassemblies and component parts in the form of Stack Time, and as such creates a linkage between the parent remanufacturing routing operation to which a remanufactured subassembly or component part is allocated for further processing, and the parent routing operation from which it is disassembled. This new MRP scheduling algorithm is optimal for calculating the total planned production time of remanufacturing production routings, and is appropriate for even large, complex, multilevel BOM structures.