The NATO - EMBO Advanced Study Institute - Lecture Course on "CHROMOSOME DAMAGE AND REPAIR" was held at God¢ysund Fjord Hotel outside Bergen, Norway. from Ms\r 27th to June 5th, 1980. This book represents the proceedings of this meeting. In addition to the for­ mal lectures, a number of short contributions presented in the dis­ cussion sessions following the lectures are also included. The papers have been divided into different groups according to topic, essentially in the same way as they were presented during the meet­ ing. The editors have m. ade' few alterations in the manuscript sub­ mitted and these were mostly confined to typing style and correc­