Under the CORE research programme, supported by the United States Agency for International Development/Office of US Foreign Disaster Assistance (USAID/OFDA), Humanitarian Outcomes is conducting remote surveys of crisis-affected populations in hard-to-reach areas to gain their perspectives on access to aid and the effectiveness of the humanitarian response. The results of the surveys on coverage, operational reach, and effectiveness (SCORE), together with key informant interviews and other contextual data, help identify the humanitarian actors that have achieved the greatest presence and coverage. This first report of the series focuses on northeast Nigeria.