EU decentralised agencies are submitted to some financial and administrative requirements initially established for the EU Institutions (e.g. arising from Staff Regulation, Financial Regulation). Given the size of most of them, a significant proportion of their staff is dealing with administrative tasks. The study aimed at proposing ways to address these issues. Following, among others, a survey among decentralised Agencies, it presents conclusions and recommendations as to : - existing common support services, mainly at Commission's level; - further functional areas suitable for shared services, such as those related to the budgetary process, procurement procedures and legal advice; - and the possible organisation of such shared services for EU Agencies.