1. The organizer: what it meant, and means, to developmental biology Jonathan Slack 2. Organizers/signalling regions that pattern the limb Marian Ros 3. Organizers/signalling regions in the branchial arches Joy Richman 4. The notochord/floor plate as a possible organizer Marysia Placzek 5. Transport and gradient formation of Wnt and Fgf in the early zebrafish gastrula Steffen Scholpp