The processes of the establishment and facilitation of inter-organizational collaboration in German nanotechnology network are differently influenced by proximity dimentions. Collaborations are very important for newly emerging technologies such as nanotechnology. With this master thesis we focus on howgeographical, organizational and technological proximities influence collaboration activities in nanotechnology. We base the analyses on publication data for the last three years. We were able to show which of these dimensions play a role in establishing and facilitatingcollaborations using methods of regression analysis. While geographical and technological proximity directlyaffect both of these processes, organizational is only affecting the establishment of collaborations. We explain why proximity and collaboration are related in such ways. Based on that we offer management and policy recommendations.