Health care is a social as well as a scientific process, and changes in health care delivery necessitate changes in preparation. Four types of changes, with their implications, are: graph or curve-extension change (past history and present observable fact--health manpower has become the greatest growth area in modern American employment); scientific and technical change (the effects of innovation); delivery system change (consequent shifts in proportions of people working in different areas); and quality control change (credentialling, licensure, and other reforms). The evolution of two systems, well-care and sick-care, will result in the need for workers in the preventive aspects of health, including dietitians, records workers, health sociologists, diagnostic workers, expanded-role nurses, and health educators. Educational planners may be interested in the predictions that the use of institutional licensure will soon be widespread, based on task performance, and that changes in delivery and quality control will require a team approach of both educators and practitioners. (AJ)