This paper aims first at determining and modeling herding behavior of mixed Tunisian Undertakings of Collective Investment in Transferable Securities funds (OPCVM) observed from January 2006 to December 2015, using monthly data and second at systematically examining the effect of the 2011 revolution on this behavior. To this end, we use the methodology of Christie and Hwang (1995) and Chang et al. (2000). However, to give more robustness to our results, a questionnaire-based survey was developed for the purpose. At this level, we studied the relationship between average funds returns and average absolute dispersion (proposed by these authors), using an OLS regression to eliminate heteroskedasticity. We found that managers of OPCVM in Tunisia did not adopt a herding behavior either before or after the revolution.