Maslow's model is easy to understand, quite popular, and the best research evidence supports the existence of a precise five-step hierarchy of needs.

Maslow's Model

A theory in psychology proposed by Abraham Maslow, often depicted as a hierarchy of needs, suggesting that people are motivated by fulfilling basic needs before moving on to other, more advanced needs.

Five-Step Hierarchy

A structured series of levels or stages in a particular process or system, often outlined in a progressive manner.