Motivation Theories By kelly_m 1900 Instinct Theory Period: 1900 to 2025 motivation 1938 Skinner’s Reinforcement Theory 1940 Drive-Reduction Theory 1943 Maslow’s Hierarchy Of Needs 1956 Herzberg’s Two Factor Theory 1958 Landsberger’s Hawthorne Effect 1960 McGregor’s X and Y theory 1961 McClelland’s Acquired Needs Theory 1963 Adam’s Equity Theory 1964 Vroom’s Expectancy Theory 1968 Edwin Locke’s Goal-Setting Theory 1969 Alderfer's ERG Theory 1972 Attribution Theory 1974 Three-Dimensional Theory of Attribution 1974 Weiner’s Three-Dimensional Theory of Attribution 1980 Eccles Expectancy Value Theory 1980 Expectancy Value Theory 1985 Pygmalion Effect 1985 Deci & Ryan’s Self Determination Theory 1986 Social Cognitive Theory 1988 Goal Orientation Theory 2010 Pink’s Theory of Motivation 2011 Amabile & Kramer's Progress Theory