This reprint (from a 1961 article) and excerpt (from a 1977 paper) recommend definitions of various terms in the field of mental retardation, such as subaverage, organic retardation, and functional retardation and argue that incidence and prevalence estimates of mental retardation vary so remarkably and change so frequently to fit certain…

This reprinted paper was originally published in 1981 and addresses issues of classification of children with disabilities in the United Kingdom. It considers several "within-child" and several interactive models in special education and concludes by encouraging the stating of children's special educational needs rather than…