Industrial and organizational psychology (also known as IO psychology, work psychology, or personnel psychology) is the scientific study of employees, workplaces, and organizations. Industrial and organizational psychologists contribute to an organization’s success by improving the performance and well-being of its people. An I/O psychologist researches and identifies how behaviors and attitudes can be improved through hiring practices, training programs, and feedback systems.[1] I/O psychologists also help organizations transition among periods of change and development. Industrial and organizational psychology is related to the concepts of organizational behavior and human capital.
-Wikipedia
Industrial-organizational (IO) psychology is the scientific study of the workplace. Rigor and methods of psychology are applied to issues of critical relevance to business, including talent management, coaching, assessment, selection, training, organizational development, performance, and work-life balance.
-Society for Industrial and Organizational Psychology (SIOP)
Industrial-organizational (IO) psychology is concerned with the study of workplace behavior. I-O psychologists often apply research to increasing workplace productivity, selecting employees best suited for particular jobs and product testing.
Industrial organizational psychology is the branch of psychology that applies psychological theories and principles to organizations. Often referred to as I/O psychology, this field focuses on increasing workplace productivity and related issues such as the physical and mental well being of employees. Industrial organizational psychologists perform a wide variety of tasks, including studying worker attitudes and behavior, evaluating companies and conducting leadership training.
-Kendra Cherry, About.com