As part of the project ‘Building Capacities for Effective Implementation of the Arms Trade Treaty (ATT)’, the Geneva Centre for Security Policy (GCSP) organized the ninth edition of its executive education course in Geneva, Switzerland, on 9-13 April, 2018. The activity was funded by the UN Trust Facility Supporting Cooperation on Arms Regulation (UNSCAR) and the Friedrich-Ebert Stiftung (FES). The course was attended by 28 diplomats, military officers, customs or police officers as well as civil society representatives from Austria, Burundi, Cameroon, Central African Republic, Colombia, Costa Rica, El Salvador, Guinea, Malaysia, Mauritius, Morocco, Mozambique, Nigeria, Panama, Philippines, Romania, Switzerland, Thailand, Togo, Trinidad and Tobago, and the United Kingdom. The course provided an opportunity for participants to discuss with experts, and engage in exercises, on the oversight of the ATT; global and regional trends in the conventional arms trade; history of the negotiation of the ATT; scope and control list; export assessment; diversion; information exchange; gender-based violence; international cooperation and assistance, including the ATT Voluntary Trust Fund; end-use/user certification; the role of the UN; fighting illicit arms trafficking; export control and the Wassenaar Arrangement; the compulsory and voluntary provisions of the ATT; import, transit, trans-shipment, and brokering controls.