Final answer:
Alderfer's ERG theory lists three core needs: Relatedness, Existence, and Growth. These needs can motivate simultaneously, and frustration in higher-order needs can lead to a regression to lower-level needs, which differs from Maslow's strictly hierarchical model.
Step-by-step explanation:
The correct answer to the question is Relatedness, Existence, and Growth. Clayton Alderfer's ERG theory is simplified into three core needs: existence, which covers basic material and physiological needs; relatedness, which deals with the need for interpersonal relationships and is comparable to Maslow's belongingness and love needs; and growth, which focuses on personal development and is akin to Maslow's esteem and self-actualization needs. This model is a rework of Abraham Maslow's hierarchy of needs and addresses some criticisms of Maslow's pyramid, suggesting that more than one need can motivate at the same time and recognizing that when higher-order needs are frustrated, a person may regress to lower-level needs, which Maslow's theory does not accommodate.
Unlike Maslow's hierarchy, which is strictly hierarchical, Alderfer's ERG theory allows for different levels of needs to be pursued simultaneously. It emphasizes that there can be a regression to lower-level needs when higher-level needs are unmet, which is not clearly defined in Maslow’s model. Also, in contrast to Maslow, Alderfer did not see these human needs being structured in a strict hierarchy, meaning that more than one category of needs could be operative at the same time.