Final answer:
The manager should use the Shortest Processing Time (SPT) priority rule to minimize the makespan of the schedule in a system consisting of two unique workstations.
Step-by-step explanation:
When attempting to minimize the makespan of a schedule in a system consisting of two unique workstations, the manager can use the priority rule called Shortest Processing Time (SPT). This rule prioritizes the tasks with the shortest processing times to be scheduled first. By allocating the shorter tasks to the workstations, the manager can reduce the overall time required to complete all the tasks, thereby minimizing the makespan.
For example, let's say workstation A has tasks with processing times of 3, 5, and 4, while workstation B has tasks with processing times of 8, 6, and 7. Using the SPT rule, the manager would schedule the tasks in the following order: A-3, A-4, A-5, B-6, B-7, B-8. This arrangement ensures that the shorter tasks are completed earlier, leading to a shorter overall makespan.
Therefore, to minimize the makespan in a system with two unique workstations, the manager should utilize the Shortest Processing Time (SPT) priority rule.