15As far as an express decision rejecting a complaint challenging a promotion is concerned, the ESC points out that although the appointing authority is obliged to state reasons for such decisions, it is neither required to disclose to the unsuccessful candidate the comparative assessment made by it of him and the successful candidate for promotion nor must it set out in detail in what way it considered that the appointed candidate fulfilled the conditions in the vacancy notice. The appointing authority may confine itself to a statement of reasons concerning the fulfilment of the legal conditions on which the validity of a promotion depends (see the judgments of the Court of First Instance in Case T-25/90Schönherr v Economic and Social Committee [1992] ECR II-63, paragraph 21, and in Case T-11/91Schloh v Council [1992] ECR II-203, paragraph 73). The ESC maintains, however, that in this instance the reasons given, although succinct, fulfil those requirements and satisfy the purpose of the duty to state the reasons upon which a decision is based, which are to permit both the person concerned and the Court to review the legality of the decision and recognize the essential factors which guided the administration in its decision (see, for example, the judgment of the Court of Justice in Case C-169/88Prelle v Commission [1989] ECR 4335, paragraphs 9 and 10).