The Oslo Forum is an unusual gathering of high-level political mediators, organized by the Centre for Humanitarian Dialogue. They have gathered a book of essays on mediation, by authors including Swedish foreign minister Carl Bildt and Norwegian foreign minister, Espen Barth Eide. I was very honoured to be invited to contribute. My essay tries to specify exactly what kind of conditions are necessary for successful mediation, in particular what kinds of access, to both negotiations and information. You can download the book, for free, here.