The instruction manual provides 12 step-by-step instructions for air traffic control supervisors in conducting over-the-shoulder training observations of enroute center controllers. Since the primary purpose of the review is to quickly identify training needs and requirements, the control responsibilities are approached from a deficiency viewpoint, and descriptions of functions and duties are written as performance deficiencies. The functions and duties covered are: separation, control judgment, traffic management, operating methods and procedures, coordination and communication, phraseology, and equipment. These are further subdivided into specific tasks. It is recommended that the controller's performance be observed for a minimum of four 10-minute periods. The Review Form for recording observations is included. (AG)