This publication aims to further promote the use and application of PSA in Member States by providing a comprehensive list of PSA applications and describing what technical features (termed `attributes’) need to be satisfied to reliably support them. Consideration has also been given to the basic set of attributes characterizing a `base case PSA’ that is performed to assess overall plant safety. The present publication can support PSA practitioners in appropriate planning of a PSA project taking into account possible uses of the PSA in the future. It can also be used by reviewers as an aid in assessing the quality of PSAs and judging the adequacy of a PSA for particular applications.