This document discusses several theories of motivation, including:
1. Maslow's hierarchy of needs theory which categorizes human needs into physiological, safety, love, esteem, and self-actualization needs that motivate in a hierarchical manner.
2. Herzberg's two-factor theory which separates motivators like achievement and recognition from hygiene factors like salary that prevent dissatisfaction.
3. Vroom's expectancy theory which proposes motivation depends on expectancy, instrumentality, and valence - the belief that effort leads to performance, performance leads to rewards, and the value placed on those rewards.
4. Porter-Lawler model which enhances Vroom's theory by including additional factors like ability, effort