B. Process Analysis Batching / Process Interruptions (Setups): Consider a process that consists of three steps 1, 2 and 3. Step 1 is a manual operation staffed by a single worker. Steps 1 and 2 are each equipped by a single machine. Step 3 is performed by a single worker. Each of the process steps works on one unit of work at a time, but must complete a set up between production batches. The required processing times and set-up times at each of the steps are listed below. There is unlimited space for buffer inventory between these steps. The system has an unlimited supply of work available to be performed (i.e., demand exceeds capacity). Process step Set up time Run time 1 50 min 2 120 min 3 0 2 min/unit 1 min/unit 5 min/unit Batch Size: (*10 points) What batch size minimizes WIP without decreasing process capacity? Assume all three steps use the same batch size, and that the transfer batch size between steps 1 and 2, and between steps 2 and 3 equals the production batch size (i.e., the units in a production batch must be moved together between steps). Batch size = Work / Explanation