The principle of effectiveness is one of the fundamental principles in EU law. Even though the principle ensures the effectiveness of all EU legislation, it also has a key role in the interpretation of EU procurement rules. The Cour of Justice of the European Union has often address the principle of effectiveness in its case law and has consistently held that, in the absence of EU rules governing the matter, it is for every member state to lay down the detailed rules of administrative and judicial procedures for safeguarding rights, which individuals derive from EU law.
K-M.Halonen, Is the remedy of contractual ineffectiveness truly effective in Finland? peer-reviewed, European Procurement & Public Private Partnership Law Review (EPPPL) 4/2015, pp. 310–315.