Alderfer’s ERG Theory – was developed by Clayton Alderfer in the 1960s. For Alderfer, a set of core needs explains behavior. E stands for existence needs, R refers to relatedness needs, and G pertains to growth needs. The needs or desire for physiological and materialistic well-being, to have meaningful relationships with others, and to grow as a human being are similar to the needs presented in Maslow’s Theory