The Fifth International Nuclear Emergency Exercise (INEX-5) was developed in response to NEA member countries' desire to test and demonstrate the value of changes put in place following the Fukushima Daiichi nuclear power plant accident. INEX-5 was held during 2015 and 2016, and was followed by the Fifth International Nuclear Emergency Exercise (INEX-5) Workshop in early 2017. Representatives from 22 member countries, the International Atomic Energy Agency and the European Commission attended the workshop, where participants identified elements emerging from INEX-5 that would help improve international and national arrangements for notification, communication and interfaces related to catastrophic events involving radiation or radiological materials. The workshop was an interactive experience structured around invited presentations, moderated discussions and breakout groups that addressed the four broad topics of communication and information sharing with other countries and international partners; cross-border and international co-ordination of protective actions; mid- and long-term aspects of recovery; and connections with the work of other international organisations and networks. These proceedings provide a summary of the proposals and recommendations for future work in emergency management.