Communicative interaction is crucial for horizontally structured coordination of political action. In the political science debate, not only the term ‘governance’ has enjoyed widespread popularity since the 1990s. In the same period, processes of preference formation and transformation have also been critically addressed in the context of the development of interpretive political science, and the resulting ‘cognitive turn’ has emphasized the importance of knowledge in changes to institutionally determined structures and policy contents. Horizontally structured forms of political coordination of action fulfil their function through the mutual influence that actors interacting in networks have on each other – where influence is understood as a dimension of power alongside domination. Evidence which shows the relevance of particular forms of available knowledge differ because there are various ‘modes of constructing evidence’. Offers of knowledge that, together with the supporting forms of evidence, are validated in the context of a certain knowledge order have a greater chance of becoming decision-relevant knowledge.