Last year, the UN General Assembly responded to the strong demand from many countries that Secretary-General Ban Ki-moon's successor be chosen in a more open process, unanimously adopting a resolution allowing public hearings on how candidates would respond to global crises and run the UN's far-flung bureaucracy.
The secretary-general is chosen by the 193-member General Assembly on the recommendation of the 15-member Security Council, according to the UN Charter.
But General Assembly President Mogens Lykketoft said in a recent interview that the two-hour public discussions with each of the eight current candidates, starting Tuesday, are "potentially game-changing."
If a leading candidate emerges and a critical number of countries rally around him or, in what would be a first, her "I think it will be very difficult, and probably not possible, for the Security Council to come up with quite a different candidate," he said.