The OECD and its U.S. administrator, McGraw-Hill Education CTB, have recently concluded the first cycle of the OECD-Test for Schools in the U.S. This test is being marketed to local schools and is designed to compare 15-year-olds from individual participating schools against peers nationally and internationally using the OECD's PISA test as its foundation. This article discusses what PISA can and can't tell the United States about its education system and describes important aspects of the PISA design that educators should consider before participating in the school-based version of this international assessment.