<P> Some commentators focus on the difference between the hedonistic tradition of seeking pleasant and avoiding unpleasant experiences, and the eudaimonic tradition of living life in a full and deeply satisfying way . </P> <P> Maslow's hierarchy of needs is a pyramid depicting the levels of human needs, psychological, and physical . When a human being ascends the steps of the pyramid, he reaches self - actualization . Beyond the routine of needs fulfillment, Maslow envisioned moments of extraordinary experience, known as peak experiences, profound moments of love, understanding, happiness, or rapture, during which a person feels more whole, alive, self - sufficient, and yet a part of the world . This is similar to the flow concept of Mihály Csíkszentmihályi . </P> <P> Self - determination theory relates intrinsic motivation to three needs: competence, autonomy, and relatedness . </P> <P> During the past two decades, the field of positive psychology has expanded drastically in terms of scientific publications, and has produced many different views on causes of happiness, and on factors that correlate with happiness . Numerous short - term self - help interventions have been developed and demonstrated to improve well - being . </P>

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