This is because teachers are required to manage a classroom with several students in a less structured environment than that offered in clinics and special education classrooms.
Mae hyn oherwydd bod gofyn i athrawon reoli ystafell ddosbarth gyda nifer o fyfyrwyr mewn amgylchedd llai strwythuredig nag y gellir ei gynnig mewn clinigau a dosbarthiadau addysg arbennig.