This book constitutes the refereed proceedings of the 13th IFIP WG 5.5 Working Conference on Virtual Enterprises, PRO-VE 2012, held in Bournemouth, UK, in October 2012. The 61 revised papers presented were carefully selected from numerous submissions. They provide a comprehensive overview of identified challenges and recent advances in various collaborative network (CN) domains and their applications with a particular focus on the Internet of Services. The papers are organized in topical sections on service enhanced products; service composition; collaborative ecosystems; platform requirements; cloud-based support; colllaborative business frameworks; service design; e-governance; collaboration in traditional sectors; collaboration motivators; virtual organization breeding environments; collaboration spaces; designing collaborative networks; cost, benefits and performance; identification of patterns; co-innovation and competitiveness; collaborative behavior models; and risks, governance, trust