29As regards the substance, Article 29(1) of the Staff Regulations sets out the successive stages which must be observed when a vacant post in an institution is to be filled. Under that provision, the appointing authority must examine, in order of priority, first, the possibilities of promotion or transfer within the institution in which the vacancy arises, second, the possibility of holding competitions internal to the institution and, third, what applications for transfer have been made by officials of other institutions, before initiating a competition procedure on the basis of either qualifications or tests or of both qualifications and tests (see Case 176/73 Wan-Belle v Council [1974] ECR 1361, paragraphs 5 and 6).
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