This report presents, using a systems-oriented approach, alternative methodologies that could be used to establish aptitude requirements for Air Force occupations. It covers a description of the aptitude requirements system, a review of the interaction of aptitude requirements and personnel system actions, and a functional flow for the requirements system. A flow for the developmental activities necessary to design and implement the system is also given, followed by recommendations for development of a methodology for determining aptitude requirements for effective job performance, with separate consideration for optimal aptitude types and levels with respect to career development, assignment flexibility, and job satisfaction. (Author)