1) The ERG theory is more consistent with our knowledge of in dividable differences among people. Variables such as education, family background and cultural environment can alter the importance or driving force that a group of needs holds for a particular individual. The evidence demonstrates that people in other cultures rank the need categories differently, for instance, demonstrates that people in other cultures rank the need categories differently, for instance, natives of Spain and Japan place social needs before their psychological requirements. This would be consistent with the ERG theory. The ERG theory, therefore, represents a more valid version of need hierarchy.
2) Although there is some evidence to counter the theory's predictive value, most contemporary analysis of work motivation tends to support Alderfer's theory over Maslow's and Herzberg's. Overall, the ERG theory seems to take some of the strong points of the earlier content theories, but is less restrictive and limiting.