This document summarizes several theories of motivation:
1. Maslow's hierarchy of needs theory proposes that people are motivated to fulfill basic physiological needs, safety needs, social needs, esteem needs, and self-actualization needs.
2. McGregor's theory X and theory Y describe two views of employee motivation - theory X assumes employees dislike work while theory Y assumes employees can exercise self-direction.
3. McClelland's need theory focuses on the needs for achievement, power, and affiliation as key motivators.
4. Elton Mayo's research at Hawthorne Works found that social and psychological factors like relationships and recognition strongly influence employee motivation and productivity.