The questionnaires used for the 2019 to 2020 survey were developed by the Welsh Government following consultation with users of statistics about the Welsh language.
Datblygwyd yr holiaduron a ddefnyddiwyd ar gyfer arolwg 2019 i 2020 gan Lywodraeth Cymru yn dilyn ymgynghoriad â defnyddwyr ystadegau am y Gymraeg.