To bring Maslows need hierarchy theory of motivation in synchronization with empirical research, Clayton Alderfer redefined it in his own terms. His rework is called as ERG theory of motivation. He recategorized Maslows hierarchy of needs into three simpler and broader classes of needs: • Existence needs- These include need for basic material necessities. In short, it includes an individuals physiological and physical safety needs. • Relatedness needs- These include the aspiration individuals have for maintaining significant interpersonal relationships (be it with family, peers or superiors), getting public fame and recognition. Maslows social needs and external component of esteem needs fall under this class of need. • Growth needs- These include need for self-development and personal growth and advancement. Maslows self-actualization needs and intrinsic component of esteem needs fall under this category of need. The significance of the three classes of needs may vary for each individual. Difference between Maslow Need Hierarchy Theory and Alderfers ERG Theory ERG Theory states that at a given point of time, more than one need may be operational. ERG Theory also shows that if the fulfillment of a higher-level need is subdued, there is an increase in desire for satisfying a lower-level need. According to Maslow, an individual remains at a particular need level until that need is satisfied. While according to ERG theory, if a higher- level need aggravates, an individual may revert to increase the satisfaction of a lower- level need.
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