Since happiness is an issue with both individual and social aspects, both psychological and sociological
theories as well as the combination of both theories (socio-psychological) should be used. To investigate the
happiness issue from psychological point of view, it should be mentioned that all human beings are interested in
surviving instinctively and in order to survive, they should get their needs met. To this end, to recognize human
beings behaviors and states in the first place, the effective factors on human needs should be recognized.