A learner aged between 0 and 25 has ALN if they have a learning difficulty or disability (whether it arises from a medical condition or otherwise) which calls for additional learning provision.
Mae gan ddysgwr rhwng 0 a 25 oed ADY os oes ganddo anhawster neu anabledd dysgu (p'un a yw'n deillio o gyflwr meddygol neu fel arall) sy'n galw am ddarpariaeth ddysgu ychwanegol.