PERT is a management tool that makes possible more accurate, more objective, and more rapid planning and control of a complex project. Applied research by the ONR-MC Task Analysis project staff indicated that a full description of PERT and its applications to Occupational Field (OF) studies would be of operational value to the Office of Manpower Utilization (OMU), HQ, USMC. This report on PERT is designed to serve two purposes. First, it can be used as training material for new personnel to introduce them to techniques of planning and control in OF studies. Second, it can provide ready reference materials for individuals directly involved in designing, directing, planning, and controlling OF studies. The description of PERT in this report is specifically addressed to Task Analysis as conducted by the Marine Corps. Accordingly, the various steps, events and activities used as illustrations in the application of PERT employ the terminology of the different phases of OMU's Task Analysis process.