The International Comparison Program (shortened ICP) is a partnership of various statistical administrations of up to 199 countries guided by the World Bank.
The main partners of this program are the World Bank, IMF, UN, ADB, OECD, CISSTAT, Eurostat, AfDB ESCWA, ECLAC, DFID, ABS, IDB, NMoFA who are also all part of the executive board.
[1] The Program produces internationally comparable price and volume measures for gross domestic product (GDP).
The International Comparison Program holds surveys collecting price and expenditure data for the entire range of final goods and services at intervals of some few years (the last two were separated by six years).
The ICP tries to make different countries GDPs comparable by calculating them in PPP both currency converters and spatial price deflators.