This volume analyses the role of civil society in the reform and oversight of the security sector in post- communist countries as a key aspect of the transition towards democracy. It is widely accepted that civil society actors have an important contribution to make in the governance of the security sector. However, that specific role has not been subject to much close or comparative examination. This book constitutes an attempt to examine and compare experiences of civil society participation in security oversight across Central and Eastern Europe. The first part of the volume presents the reader with the theoretical and conceptual background against which the potential role of civil society in security sector governance can be understood and assessed. The remainder of the book is comprised of nine country studies of civil society engagement with the security sector. Reviewing developments over the past 15 years of regime transformation in the region, the book draws upon a rich variety of cases that cast light on the different experiences, challenges, and successes of civil society actors and the media in democratisation, security sector reform, and the exercise of democratic oversight of the security sector.