Happiness is most basic concept investigated in positive psychology. The goal of present study was to examin motivational dimensions of happiness. To achieve this purpose, the effect of goal orientations included mastery, performance-approach, and performance-avoidance on happiness were studied. Participants were 490 students, including 280 girls and 210 boys, selected from different colleges of Shiraz University. The measures of study were Revised version of Oxford Happiness Questionnaire (OHQ-R) and Achievement Goal Questionnaire (AGQ). Cronbach alpha coefficient was calculated in order to determine of reliability of the measures. For testing validity of the instruments factor analysis and item-total correlation methods were used. Additionally, convergent validity of OHQ-R was considered by calculating correlation between this measure and Andrew and Withy single item questionnaire. The results showed acceptable reliability and validity of instruments. By using simultaneous multiple regression method, regression of happiness on different goals was calculated. Results showed that mastery goal, positively, and performance-avoidance goal, negatively, were significant predictors of happiness. In relation to performance-approach goal, direction of prediction was positive but amount of it was low. These results confirmed the research hypothesis about the effects of goals on happiness and motivational dimensions of it, too.
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