Inga-Britt Ahlenius | status = Active | established = 1994 | website = http://www.un.org/Depts/oios | parent = United Nations Secretariat | subsidiaries = | commons = | footnotes = |}} The United Nations Office of Internal Oversight Services (OIOS)'s a United Nations organ whose primary purpose's to perform world-wide audit, investigation, inspection, programme monitoring, evaluation and consulting services to the United Nations Secretariat and the rest of the United Nations System.(External Li… (More on Oios)