Developed gradually by Robert Morton Nance during and before the 1930s, it derived its name from its standardisation of the variant spellings of traditional Cornish manuscripts.
Nance's recommended spelling and grammar, based on Middle Cornish, soon supplanted Henry Jenner's system, which had been based largely on Late Cornish.
Most of the older generation of Cornish users alive today would have started under this system.
[citation needed] In the 1990s, yet another variety emerged when Unified Cornish Revised (UCR) (Cornish: Kernowek Unys Amendys, "KUA") was devised by Nicholas Williams.
[citation needed] In September 2008 Agan Tavas reaffirmed its support for Unified Cornish, as well as for the SWF and for Kernowek Standard.