Chapter 5 intellectual disability (intellectual developmental disorder) Misunderstanding and mistreatment of children w/ intellectual disabilities changed little til end of. Mid-19th samuel g. howe convince contemporaries that educating feeble-minded = public responsibility and opened first humanitarian institution in n. am. 1940s parents meet in groups and create local diagnostic and guidance centers to increase availability of humane care. 1950 form national association for retarded children. Evolutionary degeneracy theory atrrib intellectual and soc pros of children w/ intellectual disability to regression to earlier pd in human evo. Society was to be protected from harm done by presence of individ w/ intellectual ability in community. Appearance, ability, behav of ppl w/ id considered evidence of lack of moral fiber led to term moral imbecile/moron: became explanation for acts of deviance and justified wide-ranging attempts to identify and ctrl individs. Defining and measuring children"s intelligence and adaptive behavior.