[en] The aim of this publication is to provide a practical tool for emergency planning for States embarking on a nuclear power programme and to fulfil, in part, functions assigned to the IAEA in the Convention on Assistance in the Case of a Nuclear Accident or Radiological Emergency ('Assistance Convention'). Under Article 5.a (ii) of the Assistance Convention, one function of the IAEA is to collect and disseminate to State Parties and Member States information concerning methodologies, techniques and available results of research relating to such emergencies. As established in the publication Preparedness and Response for a Nuclear or Radiological Emergency (IAEA Safety Standards Series No. GS-R-2), the practical goal of emergency response is 'to ensure that arrangements are in place for a timely, managed, controlled, coordinated and effective response at the scene, and at the local, regional, national and international level, to any nuclear or radiological emergency'. In 2011 the IAEA General Conference, in resolution GC(55)/RES/9, encouraged States 'embarking on new nuclear power programmes to take timely and proactive steps, based upon gradual and systematic application of IAEA safety standards, to establish and sustain a strong safety culture'. It also 'emphasizes the importance for all Member States to implement emergency preparedness and response mechanisms and develop mitigation measures at a national level, consistent with the IAEA's Safety Standards, for improving emergency preparedness and response, facilitating communication in an emergency and contributing to harmonization of national criteria for protective and other actions'. This publication, issued in the IAEA Emergency Preparedness and Response Series, is intended to assist on steps to be taken by States embarking on a nuclear power programme to establish effective national capabilities and arrangements of preparedness for and response to a nuclear or radiological emergency (hereinafter referred to as a radiation emergency), which is an important part of the safety infrastructure for a nuclear power programme. If used effectively, it will help a State to develop a capability to adequately prepare for and respond to a radiation emergency after commissioning and operation of its first nuclear power plant as a nuclear facility in threat category I or II.