This document presents a collection of selected papers produced for and discussed at the Second International Conference on Early Warning, in Bonn, Germany, in 2003, and four regional conferences in Africa, Asia/Pacific, America and Europe. The conferences focused on integrating early warning into sustainable development policy. The document notes the failure of scientists, policymakers, local authorities and other relevant actors to use early warning systems efficiently, and makes suggestions for improvement. It highlights challenges, lessons learnt and possible trajectories for further development of early warning systems, and outlines key steps towards strengthening frameworks, finding resources, and designating responsibilities. Key areas for action include improving data collection, ensuring that warning systems focus on people and achieve gender balance, and creating platforms for early warning dialogue.