One of the issues taken into considered by psychologists is to explain the relationship between personality traits and happiness. Much research has so far been done concerning happiness and the factors influencing it (Wine Howen, 1997) and psychologists focused their attention on potential sources of positive feelings, including feelings of happiness (Seligman and colleagues, 2000, Kohen and Pressman, 2005). Happiness is a scientific term used for evaluating individuals about their lives. People are able to review and assess their lives as a general judgment (such
as life satisfaction or feeling of happiness) or to assess specific areas of their lives (such as marriage or work), or their recent emotional feelings of what happened to them (pleasant emotions resulted from positive evaluation of personal experiences and low levels of unpleasant emotions resulted from negative evaluations of personal experiences) (Diener, 2005: 280). Nehon defined happiness as a set of cognitive emotions and evaluations of life and consider it as a degree of individual’s duality of life and generally evaluates it positively. Happiness is one of the fundamental concepts and components in people’s live, especially student and in many disciplines, including psychology, it is tried to understand it and that how it can facilitate people’s live. Happiness is a relatively new discipline in psychological studies.