The CGPM has 18 members. These members are well-known measurement experts who are elected by the CGPM. They must all come from different countries. One of the CIPM members must be French. They meet once or twice a year in Paris. The CIPM is assisted by a number of Consultative Committees. In February 2014 there were ten such committees. Nine of the committees are dedicated to special types of measurement such as Electricity and Magnetism, Length, Photometry and Radiometry, Thermometry and Time and Frequency. The CIPM appoints people to these committees.