As part of the project ‘Building Capacities for Effective Implementation of the Arms Trade Treaty (ATT)’, the ATT Network and the Geneva Centre for Security Policy (GCSP) organized the fifth edition of its executive education course in Geneva, Switzerland, on 4-8 April, 2016. The activity was funded by the United Nations Facility Supporting Cooperation on Arms Regulation (UNSCAR), the Friedrich-Ebert Stiftung (FES) and the Government of Sweden. The course was attended by 25 participants from governments, civil society organisations and industry from Brazil, Burkina Faso, Burundi, Canada, Costa Rica, Côte d’Ivoire, Israel, Madagascar, Mauritius, Montenegro, Mozambique, Nigeria, Peru, Seychelles, Sierra Leone, Switzerland, Thailand, and Togo. The course provided an opportunity for the participants to engage with experts from the ATT Network (Centre on Conflict, Development, and Peacebuilding (CCDP) of the Graduate Institute Geneva, the GCSP, Small Arms Survey, and the United Nations Institute for Disarmament Research (UNIDIR)) to discuss the implications and challenges of ATT implementation for States Parties and explore a number of case studies. In addition, a representative from the UN Office for Disarmament Affairs and the Head of the ATT Secretariat, Mr Dumisani Dladla, shared their insights with the participants.