Conflicts are increasingly protracted; climate-related shocks are more intense and frequent. Both contribute to a cycle of vulnerability. Sustainable development and durable solutions to displacement are not possible without peace. Humanitarian relief, development programmes and peacebuilding are not serial processes: they are all needed at the same time. To reflect this understanding, the concept of a ‘humanitarian-development nexus, or a ‘humanitarian-development-peace nexus’ has developed. It focuses on the work needed to coherently address people’s vulnerability before, during, and after crises. In 2021, NEHIH was invited to be a part of the team of research consultants that would provide key input into the creation of this NEXUS.