Quick Answer: Capacity building is the improvement in an individual's or organization's facility "to produce, perform or deploy". The terms capacity building and capacity development have often been used interchangeably, although a publication by OECD-DAC stated in 2006 that capacity development was the preferable term. Since the 1950s, international organizations, governments, non-governmental organizations and communities use the concept of capacity building as part of "social and economic development" in national and subnational plans. The United Nations Development Programme defines itself by "capacity development" in the sense of "'how UNDP works" to fulfill its mission. The UN system applies it in almost every sector, including several of the Sustainable Development Goals to be achieved by 2030. For example, the Sustainable Development Goal 17 advocates for enhanced international support for capacity building in developing countries to support national plans to implement the 2030 Agenda.