child children childrenwithsocialdisabilities classroommanagement education educationaltoys effectiveteaching elementary infant language languageacquisition languagearts languagedisordersinchildren learning learningdisabledchildren perceptual-motorlearning physicaleducationandtraining prevention reading remedialteaching responsetointervention(learningdisabledchildren) schoolfailure speechdisorders standards teaching unitedstates writing ws105h926i1976