Throughout 2013, CEB responded to calls by the General Assembly for system-wide coordination in the preparation and follow-up to United Nations conferences and summits, including the Millennium Summit, post-2015 development agenda, Istanbul Programme of Action for the Least Developed Countries, and the third International Conference on Small Island Developing States. In support of those conferences and summits, CEB developed joint contributions and enhanced United Nations system-wide coherence in the implementation of conference outcomes.