Half-wits, dunces, dullards, and idiots: though often teased and tormented, the feebleminded were once a part of the community, cared for and protected by family and community members. But in the decade of the 1840s, a group of American physicians and reformers began to view mental retardation as a social problem requiring public intervention. For the next century and a half, social science and medical professionals constructed meanings of mental retardation, at the same time incarcerating hundreds of thousands of Americans in institutions and "special" schools. James W. Trent uses public documents, private letters, investigative reports, and rare photographs to explore our changing perceptions of "feeble minds". From local family matter to state and social problem, constructions of mental retardation represent a history of ideas, techniques, and tools. Trent contends that the economic vulnerability of mentally retarded people and their families, more than the claims made for their intellectual or social limitations, has determined their institutional treatment. He finds that the focus on technical and usually psychomedical interpretations of mental retardation has led to a general ignorance of the maldistribution of resources, status, and power so evident in the lives of the retarded. Superintendents, social welfare agents, IQ testers, and sterlizers have utilized these psychological and medical paradigms to insure their own social privilege and professional legitimacy. Rather than simply moving "from care to control", state schools have made care an effective and integral part of control. In analyzing the current policy of deinstitutionalization, Trent concludes it has been moresuccessful in dispersing disabled citizens than in integrating them into American communities. Inventing the Feeble Mind powerfully shatters conventional understandings of mental retardation. It is essential reading for social workers, psychologists, historians, sociologists, educators, and all parents and relatives of mentally retarded people.