Piro (Long Island Univ.) examines the impact of the Programme for International Student Assessment (PISA) on education globally. Citing the key PISA watch-phrase—"PISA assesses the extent to which fifteen-year-old students, near the end of their compulsory education, have acquired key knowledge and skills that are essential for full participation in modern societies"—and PISA's commission by the Organization for Economic Co-operation and Development (OECD), he posits that PISA’s primacy arises from international "'aspiration' convergence," ranking fever, and the media microscope. Following a history of international comparisons, Piro outlines questions about PISA that arise from differences in culture, language, gender, student sampling, and test administration. PISA is seen as a global convener that hastens curriculum flattening worldwide, as a standardizer that creates homogenized educational policy, and as an agitator used to advocate specific educational reforms. The author discusses the promises and perils of borrowing best practices; brain, development, and motivational research connected to PISA results; and PISA's future role. Piro concludes that "how PISA will continue to find, focus, and fix its position in the landscape of global education will be most compelling and instructive to watch." Summing Up: Recommended. Lower-division undergraduates through faculty; professionals.