Based on the findings of this study, the 10th CGPM in 1954 decided that an international system should be derived from six base units to provide for the measurement of temperature and optical radiation in addition to mechanical and [[SI electromagnetism units|electromagnetic]] quantities. The six base units that were <!--"that were" expresses the preterit, and the following predicate "are" connotes the non-changing entity no matter where in time of the complements "metre," "kilogram," "second," "ampere," "kelvin," "candela"-->recommended are the [[metre]], [[kilogram]], [[second]], [[ampere]], degree Kelvin (later renamed [[kelvin]]), and [[candela]]. In 1960, the 11th CGPM named the system the ''International System of Units'', abbreviated SI from the French name, {{lang|fr|''Le Système international d'unités''}}. The seventh base unit, the [[mole (unit)|mole]], was added in 1971 by the 14th CGPM.
One of the CIPM committees, the CCU, has proposed a number of [[new SI definitions|changes]] to the definitions of the base units used in SI.<ref name="draft">{{cite web|url = http://www.bipm.org/utils/en/pdf/si_brochure_draft_ch2.pdf|title = Draft Chapter 2 for SI Brochure, following redefinitions of the base units|author = Ian Mills|publisher = CCU|date = 29 September 2010|accessdate =1 January 2011}}</ref> The CIPM meeting of October 2010 found that the proposal was not complete,<ref>{{cite web|url = http://www.bipm.org/utils/en/pdf/BIPM_Bulletin.pdf|title = BIPM Bulletin|author = Anon|publisher = BIPM|date = November 2010|accessdate =5 January 2011}}</ref> and it is expected that the CGPM will consider the full proposal in 2015.
==Units and prefixes==