The document discusses several theories of motivation proposed by different psychologists. It mentions Abraham Maslow's hierarchy of needs which classified needs from basic to complex. It also discusses Murray's achievement motive theory and Horner's fear of success motive. The document also briefly outlines theories proposed by psychoanalysts like Freud who believed in instincts as prime motivators and Adler's view of a desire for power and superiority. Other theories mentioned are phenomenal self theory proposed by Combs and Snygg and need theory stating how needs create tension and satisfaction. Finally, it summarizes Yerkes-Dodson law of arousal and expectancy value theory focusing on environmental incentives.