Maslow's hierarchy of needs

Maslow's hierarchy of needs is a theory in psychology, proposed by Abraham Maslow in his 1943 paper A Theory of Human Motivation.[2] Maslow subsequently extended the idea to include his observations of humans' innate curiosity. His theories parallel many other theories of human developmental psychology, all of which focus on describing the stages of growth in humans.

Maslow studied what he called exemplary people such as Albert Einstein, Jane Addams, Eleanor Roosevelt, and Frederick Douglass rather than mentally ill or neurotic people, writing that "the study of crippled, stunted, immature, and unhealthy specimens can yield only a cripple psychology and a cripple philosophy."[3] Maslow studied the healthiest 1% of the college student population.[4]

Maslow's theory was fully expressed in his 1954 book Motivation and Personality.

http://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs