17When undertaking that consideration, therefore, the appointing authority must have at its disposal all the information necessary to assess the merits of each candidate. It is assisted by the administrative services at the various hierarchical levels, in accordance with the principles inherent in the operation of any hierarchical administrative structure, embodied in the first paragraph of Article 21 of the Staff Regulations, under which ‘an official, whatever his rank, shall assist and tender advice to his superiors; he shall be responsible for the performance of the duties assigned to him’.
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