[2] The General Assembly resolution 51/241 in 1997 stated that, in the appointment of "the best candidate", due regard should be given to regional (continental) rotation of the appointee's national origin and to gender equality,[3]: 5 although no woman has yet served as secretary-general.However, the Security Council voted in private and followed the same process as previous selections, leading the president of the General Assembly to complain that it "does not live up to the expectations of the membership and the new standard of openness and transparency".These provisions have been interpreted as providing broad leeway for officeholders to serve a variety of roles as suited to their preferences, skill set, or circumstances.[10] Many of the secretary-general's powers are informal and left open to individual interpretation; some appointees have opted for more activist roles, while others have been more technocratic or administrative.[4] The secretary-general is often reliant upon the use of their "good offices", described as "steps taken publicly and in private, drawing upon his independence, impartiality and integrity, to prevent international disputes from arising, escalating or spreading".
Map showing which nations have had a national serving as secretary-general of the United Nations