Abstract: This chapter studies the connection between social class, mental ability, education, and entry into employment, and is a further development of the previous chapter on intergenerational mobility between occupations. The different sections of this chapter are: The association between occupation and IQ; Evidence for the genetic determination of IQ potential; The effects of differences between classes in the upbringing of children on the development of IQ; The relation between parents’ class and their children's IQ; Class differences in the use made of education; Class differences in extent of education; Education as investment: human capital theory; and Entry into employment. The last section reviews and discusses the material presented, drawing out eight main points.

Keywords: children's IQ, class, class differences, development of IQ, education, education as investment, entry into employment, extent of education, genetic determination of IQ, human capital theory, IQ, mental ability, occupation, parental class, social class, upbringing, use of education,