[en] The IAEA collection of Safety Standards and Nuclear Security Series includes more than 150 publications, all of which contain multiple cross references. Many important areas are covered in more than one publication. To make finding comprehensive information in this vast resource easy, the IAEA has developed an advanced search tool, the Nuclear Safety and  Abstract Security Online User Interface (NSSOUI), which offers users multiple ways to systematically browse and search these publications. The Safety Standards Series and Nuclear Security Series provide guidance to authorities and other relevant stakeholders on how to enhance the safety and security of nuclear technologies. They cover activities relating to nuclear installations and application of radiation sources in medicine, industry, agriculture and research. The content of the publications is developed by the IAEA in close cooperation with governments and organizations around the world. The publications are revised and updated periodically. The two sets of publications are organized in a hierarchical manner, with the Safety Fundamentals and the Nuclear Security Fundamentals applying to all activities and lower-level publications providing more specific recommendations.