The Institute for Environmental Studies and the Stockholm Environmental Institute (SEI) workshop on Fragmentation in Global Environmental Law and Governance went great. It took place from 16 to 18 May 2013 in the luscious surroundings of the Netherlands Institute for Advanced Study in Humanities and the Social Sciences (NIAS). The workshop brought experts from the legal and political science communities in the Netherlands and abroad together to explore the fragmentation of international law and governance. The workshop gathered about 30 people and led to very interesting and interactive presentations including:

• Philipp Pattberg (VU University Amsterdam) and Harro van Asselt (SEI) – Conveners and introduction
• Kenneth Abbott (Arizona State University) – Keynote Address: Institutional Fragmentation and Regime Complexity
• Frank Biermann (VU University Amsterdam) – The Fragmentation of Global Governance Architectures
• Fariborz Zelli (Lund University) – Explaining Institutional Fragmentation in Global Environmental Governance: Bringing Regime Theory Back In (presentation)
• Oscar Widerberg and Marija Isailovic (VU University Amsterdam) – Mapping Fragmentation: the Need for Integrated Perspectives and Methods (presentation)
• Joyeeta Gupta (University of Amsterdam) – Fragmentation is Inevitable, but Constitutionalization is necessary
• Aarti Gupta (Wageningen University) – REDD+ and Regime Complexity: Conceptualizing Legitimacy and Effectiveness
• Harro van Asselt (Stockholm Environment Institute/University of Oxford) – Managing Regime Interactions in Global Climate Governance (presentation)
• René Lefeber (University of Amsterdam) – Addressing breaches of multilateral environmental agreements

The workshop team is very grateful for the financial and logistical support from NIAS and the KNAW.