This paper presents a simple look-ahead rule for scheduling two or more parallel semi-automatic machines sharing the same server. The rule increases machine utilization in situations where machines and servers are highly utilized. Production is lost because of interference time. The amount of interference, as well as the output from a system depend on: (a) The distribution of loading-unloading times and processing times; (b) the priority rule used to select the next job to be processed; and (c) the number of machines assigned to the operator.