The branch of applied psychology that is concerned with efficient management of an industrial labor force and especially with problems encountered by workers in a mechanized environment.industrial psychologist n
or I-O psychology Application of the concepts and methods of experimental, clinical, and social psychology to the workplace. I-O psychologists are concerned with such matters as personnel evaluation and placement, job analysis, worker-management relations (including morale and job satisfaction), workforce training and development (including leadership training), and productivity improvement. They may work closely with business managers, industrial engineers, and human-resources professionals