 In 1901 Giorgi published a proposal for building a coherent set of units based on four base units – the metre, kilogram, second and one electrical unit (ampere, volt or ohm).In 1921 the Convention was extended to permit the promotion of standards relating to any physical quantity which greatly increased the scope of the CIPM's remit and implicitly giving it freedom to exploit Giorgi's proposals.The 8th CGPM (1933) resolved to work with other international bodies to agree standards for electrical units that could be related back to the international prototypes.