What evidence should guide humanitarian reform in an era of rising needs and shrinking resources? This event brings together financing and evaluative perspectives to explore priorities for a more effective, accountable and adaptive humanitarian system. As humanitarian needs continue to grow amid constrained resources and ongoing reform efforts, evidence-informed decision-making is more important than ever. This side event brings together two major sources of humanitarian evidence: the Global Humanitarian Assistance (GHA) Report 2026 , the leading annual assessment of international humanitarian financing , and the Synthesis of Inter-Agency Humanitarian Evaluations (IAHEs) , which distills lessons from major humanitarian crises over the past decade. The discussion will examine key trends in humanitarian financing , including donor contributions, funding gaps and reform priorities, alongside system-wide evaluative findings on what has worked, where persistent challenges remain, ...