An international organization in different times and settings can play all three roles. For instance, the UN has played, and continues to play, each role in different times. While the instrument role was dominant in the late 1940s and early 1950s, the actor capacity was prominent during Dag Hammarskjold’s term as Secretary-General, and the role as a forum coming to the front since the 1960s with the increase in membership and the new demands of the Third World (Archer, 2001:91).