Maslow's Hierarchy of Needs is a theory in psychology that proposes humans have five levels of basic needs: physiological needs, safety needs, belonging and love needs, esteem needs, and self-actualization needs. The theory suggests that lower level needs must be satisfied before higher level needs can be addressed, and that humans are constantly striving to meet higher needs and achieve self-actualization at the top of the pyramid.

1. Dr. Carsten Weerth BSc LLM (Com.) MA
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Mediation: Maslow‘s Hierarchy of Needs
(Source: http://en.wikipedia.org/wiki/Abraham_Maslow#/media/File:Maslow%27s_Hierarchy_of_Needs.svg)
The base of Maslow‘s Hierarchy of Needs are PHYSIOLOGICAL needs (basic
needs).
Above of this the SAFETY needs are located.
The middle layers of needs are BELONGING and LOVE (social needs).
The fourth layers are needs of SELF-ESTEEM (achievement, mastery, recognition,
respect).
All humans are trying to get to the top level (SELF-ACTUALIZATION needs).
Literature: http://en.wikipedia.org/wiki/Maslow%27s_hierarchy_of_needs
http://en.wikipedia.org/wiki/Abraham_Maslow