This document discusses different theories of motivation and how they relate to influencing human motivation to work. It covers Maslow's hierarchy of needs, Alderfer's ERG theory, McClelland's acquired needs, Herzberg's two-factor theory, expectancy theory, goal setting theory, equity theory, operant conditioning, and the use of reinforcement and punishment to shape behavior. The key theories discussed are Maslow's hierarchy that identifies lower and higher order needs, Herzberg's two factors of satisfiers and hygiene factors, and expectancy theory that motivation equals expectancy times instrumentality times valence.