This study problematizes the global educational governance of OECD PISA and its statistical data as a governing technology in contemporary discourses of education reforms. The study examines principles that order the discourses and practices of the international comparative assessment. The effort of analysing the impact of an education reform regime led by OECD PISA reveals how statistical reasoning defines problems in educational systems and forms social discourse surrounding educational reform to solve such problems. In doing so, this article focuses on standardization, classification, and normalization for measuring and comparing student achievement and national effectiveness. The study also offers an alternative way of considering the politics of inclusion and exclusion embedded in practices of education reforms propelled by the international comparative assessment.