As you note, Certificates are required by the Terms of Reference for 'Services', that is for studies and other work conducted by tenderers for the Commission and for other public and private recipients. 1) For Public procurement contracts, the Commission provides certificates of satisfactory execution upon request and after successful completion of such assignments. Therefore, for such studies, certificates are needed for the most important services. 2) For FP7 projects, the Commission does not provide such certificates; however, should tenderers wish to demonstrate successful completion of FP7 project, it can provide any other supporting documents (i.e approval of final report, result of projects reviews, etc…. ). It will be up to the evaluation committee to consider on a case by case basis whether the supporting evidence provided is appropriate.