MODIA (Method of Designing Instructional Alternatives) was developed to help the Air Force manage resources for formal training by systematically and explicitly relating quantitative requirements for training resources to the details of course design and course operation during the planning stage. This report describes the Resource Utilization Model (RUM), the component of MODIA that simulates course operations and reports on the flow of students through a course, and the use of the resources specified by the planner. RUM is a computerized, discrete event simulation of course operations for resource planning. The model simulates resource demand, resource allocation, and student queueing generated by student progress through the potentially complex flow patterns of an instructional course. Another MODIA component, the User Interface (UI), allows the planner to generate alternative course designs which, in turn, generate input for simulation of these courses by the RUM. The model then supplies reports on student flow bottlenecks and resource utilization in terms of actual resource hours used, average student throughput times, and other information essential to planning. Samples of the reports are provided. (Author/DAG)