Many principles characterize educational justice in terms of the relationship between educational inputs, outputs and distributive standards. Such principles depend upon the "causal pathway view" of education. It is implicit in this view that the causally effective aspects of education can be understood as separate from the normative aspects of education. Yet this view relies on an impossible division of labor between empirical and normative work in educational research: it treats the causal roles that are understood and explained objectively through empirical research as separate from the normative theorizing that informs the assessment of particular policies and practices. Such principles therefore rely on unreliable causal claims and are unable to make prescriptions about practices even according to their own conceptions of justice. Furthermore, such principles obscure other relevant considerations of justice that pertain to the internal processes of education and the structural relation of education to external social conditions.