The purpose of this article is to study interaction patterns within a steering group. Most large projects include a group of this kind whose task it is to steer towards set goals and provide the required resources. The origin of the research area lies in the observation that steering groups seem to have difficulties in living up to the expectations of project management and project participants, despite structured working methods such as regular meetings, distribution of responsibility and cooperation with different interested parties. By means of interviews and observations the article attempts to capture interaction patterns in a specific steering group. The study is anchored in theories of power with the purpose of supplying theoretical concepts and analytical tools. The most important conclusion is that the interaction patterns that emerged in the steering group rested on two foundations. The first one was that social relations in the steering group created power that was produced and manifested in different ways. The second one was that the exercise of power affected the action outcome, that is, the results of the actions and consequences for future actions. Another conclusion is that the exercising of the assignment presupposes four premises: the steering group member needs to have a positive approach to the project idea and the set goals, to have knowledge of the assignment, to have a position with the authority to make and carry out strategic decisions of the project, and be able to allocate time for active work and participation in meetings.