The document discusses several theories of motivation:
1) Maslow's hierarchy of needs theory which states that as lower level needs are met, higher level needs emerge as motivators. It identifies physiological, safety, social, esteem, and self-actualization needs.
2) ERG theory proposes three core needs: existence, relatedness, and growth that can all be operative at the same time.
3) Expectancy theory suggests that motivation depends on the strength of the expectation that effort will lead to performance and rewards.