Industrial and organizational psychology theory basically focus on the behavior of employees in the workplace. They apply psychological principles and research methods to improve the overall work environment, including performance, communication, professional satisfaction and safety.
Based on this psychology, you will have three different division which are – Industrial / Organizational / Human Factors.
Let me brief you about what is the difference between the Industrial & organizational psychology. I.e. “Industrial psychology tends to focus on hiring, training, development, assessing employee performance, and legal issues associated with those issues. Organizational psychology tends to focus on motivation, teamwork, and leadership.”