Which discipline makes the most important contribution to organizational behavior at the individual level of analysis?

Answer: Psychology

Explanation:

Organizational behavior is the research about understanding behavior and traits that are followed in organizational field by employee and other workers. Study about motivation, working pattern, work environment and surroundings, employee performance and structure is done.

The major factor behind organizational behavior of an individual is psychology which determines the behavior and thinking of the person. It states about the mind, actions, feelings, thoughts and emotions of the person working in organization and the impact that is produced in the process. Different pressure and influences are also considered in behavior pattern.