The document discusses several theories of motivation: - Maslow's hierarchy of needs argues needs must be satisfied in order from physiological to self-actualization. - Herzberg differentiated between motivators that increase satisfaction like achievement and hygiene factors to prevent dissatisfaction. - Alderfer's ERG theory grouped needs into existence, relatedness, and growth that can be simultaneously motivating. - McClelland identified needs for achievement, power, and affiliation that explain individual motivation differences.