Activities of the Test Development and Research Office (TEDRO), a division of the West African Examinations Council (WAEC), are described. The WAEC is an international educational and professional testing organization established to serve its four member countries: Nigeria, Ghana, Sierra Leone, and The Gambia. The U.S. Agency for International Development supports WAEC's program of research and development performed to introduce large-scale testing programs to West Africa. The tests are used primarily for manpower selection and for assessment of academic achievement as related to graduation requirements, college entrance, Civil Service employment, and occupational certification. TEDRO has three primary responsibilities: to initiate and coordinate all objective test development, to establish aptitude testing services, and to plan and execute research on tests and testing procedures. The history and development of testing organizations in West Africa, as well as training and research activities, are described. Particular emphasis is given to TEDRO programs completed through December 1968. Studies investigating the validity of TEDRO-developed aptitude tests are summarized. (GDC)