In recent years, several Member States have completed the decommissioning of multifacility nuclear sites. This publication consolidates their technical and organizational experience, and provides information and practical guidance that promotes safe, timely and cost effective implementation. All phases of decommissioning are discussed, from planning and dismantling to waste management and site release, as well as organizational schemes and funding. This publication is intended for decision makers, plant operators, contractors and regulators involved in planning, management, authorization and execution of decommissioning activities. It is particularly relevant for multifacility site operators with nuclear facilities approaching the end of their foreseen lifetime. The publication will also be of interest for the designers and builders of new nuclear installations in order to facilitate eventual decommissioning.