All advanced societies maintain a commitment to equal educational opportunity, which they claim to implement through a public school system that is charged toprovide all children with an education up to a state-enforced standard. Indeed, what public schools do, even in the best of circumstances, is to provide all children with a more or less equal exposure to educational inputs (teachers, books), rather than to guarantee them equal educational attainment. Children, as the schools receive them, differ markedly in their docility — due in part to innate ability, but perhaps due more to the economic status and cultural practices of their families. Many, including myself, believe that the task of schools should be to provide some measure of equal educational attainment among students of heterogeneous talent and background. Schools should devote more educational resources to students who require them in order that they be educated to an acceptable standard.

Prescriptive political and moral theories contain ideas about what human beings are like and about what, correspondingly, is good for them. Conceptions of human “nature” and corresponding human good enter into normative argument by way of support and justification. Of course, it is logically open for the ratiocinative traffic to run the other way. Strongly held convictions about the rightness or wrongness, goodness or badness, of certain social institutions or practices may help condition and shape one's responses to one or another set of propositions about what people are like and what, in consequence, they have reason to value.