[en] The R+D phase is the best period for the creation of new technologies and thus for using social and ecological chances and avoiding risks. That is why trade unions and other persons concerned no longer just react when technology already exists, but attempt to get an influence during the stage of its creation. However, how can persons concerned show their interest for a technological development whose consequences are still unknown to them. This book examines the grounds for the influence of trade unions on the technological development - i.e. possibilities and limits for orientation of technology and science towards social objectives. At the same time a concept of 'interest' is developed, which first renders the process of opinion formation accessible to empirical investigation. By analysing a lot of material, the author outlines the development of the trade union's position on the energy research sector, and explains typical problems established and first suggestions for solutions. Here, for the first time a differentiated and comprehensive material analysis of the trade unions' nuclear power discussion in the seventies and eighties is submitted. (orig.)