81Furthermore, it should be borne in mind that the organisation and operation of a service are matters for the institution alone, and the superior authority, here the executive director of the ERA, is solely responsible for the organisation of the service. It is for that authority alone to assess the needs of the service, and to assign the personnel available to it in accordance with that assessment (Labeyrie v Commission, 16/67, EU:C:1968:37, paragraph 445; Geist v Commission, 61/76, EU:C:1977:127, paragraph 38; Pitrone v Commission, T‑46/89, EU:T:1990:62, paragraph 60; and Cesaratto v Parliament, T‑108/96, EU:T:1997:115, paragraph 48).
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