The aim of this report is to support the efforts of OECD DAC members and others to better integrate conflict early warning analysis and response into their programming. The report is based on a review of the literature on early warning and response and inputs from surveyed agencies. It seeks to assess the value and role of early warning for the prevention of violent conflict and peacebuilding; identify the most effective early warning and response systems; evaluate the strengths and weaknesses of different systems; pinpoint the obstacles to early response; and make some tentative judgements on what the role of OECD DAC could be in influencing future developments in this field.