An integrated production planning and scheduling framework for make-to-order environment

A capacity constrained integrated production planning and scheduling framework for a manufacturing firm operating in make-to-order environment, has been formalized. It primarily aims at the generation of shop floor schedules that are feasible with production plans generated at a higher level, practical and efficient at the shop floor. The formalized framework integrates capacity planning, loading and scheduling activities of a job-shop with consideration of process plans flexibility. The performance of framework is assessed through two case studies. Experimental investigation reveals that shop utilization level considered at capacity planning level affects master production schedule and system performance. Further, presence of multiple process plans improves system performance; especially, they assist in reducing the number of tardy part-types. Moreover, shortest processing time dispatching rule performs better than earliest due date during scheduling.