Current environmental problems are core responsibilities of politics, economy and the social life. The combination of these three fields is essential for solving and refurbishing regional and global environmental crises. This thesis will study the outcomes of political measures for dealing with environmental issues. While taking into account social norms and pro-environmental attitudes, the social acceptance, application and diffusion of electric mobility is analyzed. The paper compares two theoretical approaches to the regulation of social influence. First, Mertons reference group theory and second, the social impact theory from Latané is discussed. These approaches form the background for the empirical survey and the data analyses. What follows is an interdisciplinary comparison of both theories.This master's thesis is a follow-up study of a project, which was conducted by the Wegener Center Graz. In December 2011, approximately 1.500 owners of e-vehicles were interviewed by means of a mailed questionnaire, on the impact of the purchase of an e-vehicle. For this study a second wave of data collection was carried out by means of a survey on a sub-sample (n1=157) of the first wave of data collection. Moreover, another survey was developed in order to interview friends (n2=42) of these e-vehicle owners. This second wave of data collection was conducted as an online survey to facilitate the dispersion of the survey by e-vehicle owners to their acquaintances.First, the results of this survey show that the social and personal norms of e-vehicle owners are very stable across the two points in time. Second, it turns out that pro-environmental norms of e-vehicle owners and their acquaintances correlate rather weak (r = 0.119). Furthermore, only a weak diffusion of pro-environmental norms and values could be determined in this sample. Finally, the analysis of relevant indicators of social influence based on the two theories provides clear results for only a few items.