Early planning and effective and safe implementation and completion of decommissioning of facilities using radioactive material is increasingly drawing the attention of regulators, operators, the public and other interested parties around the world. This publication is the proceedings of a conference convened with the aim of sharing experience and knowledge and to identify areas of international harmonization in the decommissioning of various facilities (e.g. nuclear power plants, fuel cycle facilities, research reactors, mining and mineral processing facilities, research laboratories). The conference addressed a wide range of topics, namely, the regulation of decommissioning activities, planning for decommissioning, implementation of decommissioning activities, waste management, technology, social and economic impacts and decommissioning of small facilities.