Although experts agree that various types of learning disabilities do exist, few attempts have been made to classify learning disabled children into subtypes. The editors of this collection feel that the lack of subcategorization has frustrated previous research efforts to obtain a generalizable body of knowledge in the field. To meet this critical need for definitive information, this book presents basic reviews and theoretical approaches used to subtype learning disabled children -- ranging from a behavior genetics approach to a dimensional approach. It also demonstrates actual research methods utilizing theoretical approaches.