Clayton Alderfer

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Clayton Paul Alderfer is an American psychologist who further expanded Maslow's hierarchy of needs by categorizing the hierarchy into his ERG theory (Existence, Relatedness and Growth). Alderfer categorized the lower order needs (Physiological and Safety) into the Existence category. He fit Maslow's interpersonal love and esteem needs into the relatedness category. The growth category contained the Self Actualization and self esteem needs.

Alderfer also proposed a regression theory to go along with the ERG theory. He said that when needs in a higher category are not met then individuals redouble the efforts invested in a lower category need. For example if self actualization or self esteem is not met then individuals will invest more effort in the relatedness category in the hopes of achieving the higher need.

[edit] References

Alderfer, C. P. The Methodology of Organizational Diagnosis, Professional Psychology, 1980, 11, 459-468.
Alderfer, C. P. An Intergroup Perspective on Group Dynamics. In J. W. Lorsch (editor), Handbook of Organizational Behavior, 1987, 190-222.
Alderfer, C. P. Consulting to Underbounded Systems, C. P. Alderfer and C. L. Cooper (editors), Advances in Experiential Social Processes, 1980, 2, 267-295.
Alderfer, C. P. Improving organizational communication through long-term intergroup intervention, Journal of Applied Behavioral Science, 1977, 13, 193-210.
Alderfer, C. P. and Brown, L. D. Learning from changing, 47-56,129-141.
Alderfer, C.P. (2005). The Five Laws of Group and Intergroup Dynamics.