The CCN, co-ordinated by the IAEA, groups eleven data centres or institutes on various aspects of computational AM/PSI data. Its Steering Comittee, composed of members, meets biennally. Its purpose is to review the current status and research activities in computational tools related to atomic, molecular and particle surface interaction (AM/PSI) data generation, and to co-ordinate these research activities in the form of a network accessible by the fusion research community.