The specific role, function, and qualifications for six jobs in diagnostic radiologic technology (excluding physicians and health physicists) were delineated through task analyses. The levels are not job titles but can be described in terms of function. Among other duties, the Level I position provides nonspecialized assistance to radiologic personnel; Level II develops, reproduces, indexes, and files x-ray films; Level III performs routine radiographic procedures; Level IV carries out specialized radiographic procedures requiring knowledge and understanding of more complex and sophisticated procedures and equipment; Level V provides supervision and coordination of ancillary personnel; and the Level VI position uses management skills to provide for the development and appreciation of departmental policies, budgets, and long range planning. Based on detailed job descriptions and justification for this hierarchy, a national advisory committee decided that the development of a proficiency test is most appropriate for the Level III position. A criterion referenced test has been developed to measure competencies for on the job performance which reflect what is learned in active work experiences or through other than formal academic programs. The construction of the test, the development of a guide for curriculum design, recommended policies and procedures for credentialing the Level III position, and the potential use of audiovisual materials for proficiency listing are described. (EVH)