Purchasing .Fabrication Assembly Distribution Figure 1.1: Multi-Level Manufacturing System for Make-to-Order Products specific resources of a type, i.e., a certain machine or a single worker, the determination of the sequence operations are processed on a ma- chine, and the assignment of start and finish times to operations. We will modify this framework to be specifically suited for multi- level make-to-order manufacturing systems. We assume that the facil- ity design issue is settled, i.e., the location and the layout of the facility as well as the capacity ofthe three main resource types...