Our purpose in this research was to investigate the role of passion (Vallerand et al., 2003) for a given activity in the quality of interpersonal relationships experienced within the context of that activity in 4 studies. Study 1 demonstrated that a harmonious passion was positively associated with the quality of interpersonal relationships within the context of the passionate activity, whereas an obsessive passion was unrelated to it. Furthermore, in line with the broaden-and-build theory (Fredrickson, 2001), results also showed that positive emotions experienced at work fully mediated the relation between harmonious passion and quality of interpersonal relationships. Obsessive passion was not associated with positive emotions. Study 2 replicated the results from Study 1 while controlling for trait extraversion. Also, in Study 2, we examined the negative mediating role of negative emotions between obsessive passion and quality of interpersonal relationships. Finally, Studies 3 and 4 replicated the results of Study 2 with prospective designs and with objective ratings of interpersonal relationships quality. Implications for the dualistic model of passion and the broaden-and-build theory are discussed.

The purpose of the present research was to examine the differences in well-being between passionate and non-passionate individuals of various age groups. The results of two studies (total n = 885) provided support for the hypothesis that being harmoniously passionate for an activity contributes significantly to both hedonic and eudaimonic well-being, while being obsessively passionate for an activity or having no passion at all does not contribute to well-being. Furthermore, results from Study 2 showed that only harmoniously passionate people experienced an increase in subjective vitality over a 1-year period compared to obsessively passionate and non-passionate people who did not differ from each other. These results also held true after controlling for the effect of age and gender. It would thus appear that passion does make a difference in people's lives, as long as such passion is harmonious in nature.

This article investigates the relationship between passion and the attainment of an elite level of performance within a population of expert musicians. Furthermore, the mediational role of performance goals and deliberate practice between passion and performance is also explored. Results of the path analysis showed that harmonious passion predicted the use of mastery goals, which in turn predicted the use of deliberate practice and a higher level of performance. On the other hand, obsessive passion positively predicted approach and avoidance goals with both having a direct negative impact on performance attainment. Consistent with previous research on passion, results also showed that harmonious, but not obsessive passion, was a positive predictor of subjective well-being. These results suggest the existence of two different pathways linking passion and elite performance, the harmonious passion path being the most adaptive.

Using signature strengths at work has been shown to influence workers' optimal functioning and well-being. However, little is known about the processes through which signature strengths lead to positive outcomes. The present research thus aimed at exploring the role of having a harmonious passion in the relation between using signature strengths and well-being. For this purpose, an intervention was developed where participants (n = 186) completed three activities aiming at developing their knowledge and use of their signature strengths at work. The results showed (1) that the intervention successfully increased participants' use of their signature strengths, (2) that participants from the experimental group reported a higher use of their signature strengths at the end of the study than participants from the control group, and (3) that increases in the use of signature strengths reported by participants from the experimental group were related to increases in harmonious passion, which in turn led to higher levels of well-being.

The purpose of the present research was to test the applicability of the Dualistic Model of Passion to being a sport (football) fan. The model posits that passion is a strong inclination toward an activity that individuals like (or even love), that they value, and in which they invest time and energy. Furthermore, two types of passion are proposed: harmonious and obsessive passion. While obsessive passion entails an uncontrollable urge to engage in the passionate activity, harmonious passion entails a sense of volition while engaging in the activity.