This report by the Working Group on Analysis and Management of Accidents (WGAMA) summarises the first Nuclear Energy Agency (NEA) project to address the topic of severe accident management guidance (SAMG) verification and validation, with a particular focus on the use of analytical simulations as one of the means to inform SAMG in nuclear power plants. The report describes the current practices aiming at ensuring the correctness, adequacy, usability and efficiency of SAMG, provides an overview of national examples of past and ongoing assessments of severe accident management (SAM) and summarises recommended practices with regard to the use of analytical simulations.