A survey of all schools, pupil referral units and non-maintained early years settings in Wales was distributed in June 2021 through multiple channels.
Dosbarthwyd arolwg i holl ysgolion, unedau cyfeirio disgyblion a lleoliadau blynyddoedd cynnar nas cynhelir yng Nghymru ym Mehefin 2021 drwy nifer o ddulliau.