Professional and higher-level categories of staff, including directors, perform roles which require skills and expertise that must be recruited internationally. A university degree, or more often an advanced university degree is a mandatory requirement. Professional and higher-level staff categories range from the ICS 8 – ICS14 (P1, P2, P3, P4, P5, P6, P7, D1, D2) levels. Internationally recruited staff may be expected to rotate and accept assignments in different duty stations/locations in the course of their career.