A roster is a temporary pool of candidates who were not selected for an advertised position but recommended for it immediately after a competitive recruitment exercise. They are therefore considered pre-approved candidates available for further selections. The provision of rosters is an exception to the general principle that only successful candidates of a competitive recruitment process can be recruited for advertised positions. The institution of rosters is in general allowed in the interest of the Organization, which can so cover staffing needs without a new competitive process being...