Needs

As with many other concepts in the history of psychology, the definition of needs has been controversial, multifaceted, even ambiguous. Definitions, theoretical models and methodological approaches to psychological needs can vary according to some characteristics such as: (i) the goal (survive or thrive); (ii) the source (genetic or learned); (iii) the level of analysis (biological, individual, or social); (iv) the conceptual structure (hierarchical or independent); (v) the number of needs