However, a number of sound studies have found worthwhile literacy gains made by adults attending dedicated basic skills courses.
Fodd bynnag, mae nifer o astudiaethau cadarn wedi dod i’r casgliad bod oedolion sy’n mynychu cyrsiau penodol ar gyfer sgiliau sylfaenol wedi bod ar eu hennill o ran llythrennedd er budd mawr iddynt.