Human capital theory and rate of return methodology have long been a dominant framework in comparative and international education and other fields. While there have been criticisms since its inception, it has been ubiquitous and widely accepted as an important mechanism for educational planning, evaluation, and policy making. In this article, I raise fundamental questions about the internal logic of this framework. In particular, I examine the problems with its two strands of empirical work, dealing with the impact of education on income and economic growth, as well as with its conceptual base. In conclusion, I briefly examine some alternatives to using a human capital framework for educational planning, evaluation, and policy making.