Each of the current eight candidates will be formally introduced to the General Assembly, which includes representatives from all 193 Member States and two Observers - the State of Palestine and the Holy See - in three days of informal dialogues beginning from April 12.
The general public can ask questions through civil society members and social media.
The Secretary-General has traditionally been selected behind closed-doors by a few powerful countries but for the first time in its history, this year the selection will involve public discussions with each candidate campaigning for the world's top diplomatic post.
With no woman leading the organisation in its 70-year-old history, there is an unprecedented call from nations and civil societies to select a woman to lead the organisation.
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Three of the candidates are from Eastern Europe, one of whom is a current UN official.
The other candidates are former Macedonian Foreign Minister Srgjan Kerim, former Montenegro Prime Minister and current Foreign Minister Igor Luksic, former Slovenian President Danilo Turk and former UN refugee chief and Portuguese Prime Minister Antonio Guterres.
"While on the surface, informal public discussions do not
India has repeatedly called for changing and improving the existing process of selecting the world body's chief, with its former UN envoy Asoke Mukerji saying last year that gender equality and regional rotation should be given due regard.
Informal dialogues with the candidates will begin on April 12 and continue for two days. The next round of dialogues will be in June and the Security Council will begin deliberations in July.
Following introductory remarks by each candidate, UN member states will have either two or three minutes to ask questions on behalf of their countries or geographic grouping.
Candidates have also been encouraged to take to social media and more than 500 questions have already been submitted for the candidates, ranging from 'what criteria would the candidate use to make senior appointments' to 'how will your measures end world poverty' and 'how will you bring peace to the Middle East.'
Lykketoft expressed optimism that all this will culminate "for the first time in United Nations history, in a very transparent process which hopefully also will lead to a much clearer formulation of what are we expecting from the membership of the UN of the challenges and competencies of the next Secretary-General".