The Language Use Survey 2019-20 was carried out as part of the National Survey for Wales, in similar fashion to the Welsh Language Use Survey 2013-15.
Elfen atodol o Arolwg Cenedlaethol Cymru oedd Arolwg Defnydd Iaith 2019-20, yn yr un modd ag Arolwg Defnydd Iaith 2013-15.