Although Boudon’s distinction between primary and secondary effects, and its associated rational action models of inequality of educational opportunity, have been more influential in the field of social stratification and mobility than in the sociology of education, there is good reason to reconsider the theoretical and practical implications of this approach. The investigation brings conceptual analysis and empirical research to bear on Boudon’s arguments in a manner that may be somewhat unorthodox. The theoretical arguments are developed in the context of a detailed empirical investigation of three transitions—age 10 to O-level, O-level to A-level, and A-level to degree—using the extensive 1970 British Cohort Study. It is concluded that primary and secondary effects should be recognised as methodological rather than theoretical concepts, that the techniques used to identify them are independent of rational action theory and that, contrary to an influential position, the evidence suggests that primary effects are more important than secondary effects in the generation of social disparities in access to education

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