"The paper aims to address some of the theoretical and normative issues involved in transforming post-authoritarian media systems, which have been described and analysed in the country studies of this working paper series. The discussion starts by introducing the concept of ‘social constructivism’ as an effective theoretical tool to understand processes of institutional change in processes of democratic transition. Two key elements of media systems serve as examples to demonstrate the ‘social construction’ of norms and practices in different social and political contexts: partisanship and pluralism. While partisanship is seen as a deficiency of media systems, albeit widely practiced, pluralism is valued as an indispensible norm of democratic media, yet difficult to achieve." (Introduction)