When journalists describe U.S. students as academically “behind” other countries or that Singapore has one of the best education systems in the world, they are often referring to performance on the Programme for International Student Assessment (PISA), an exam given to students to evaluate critical thinking and application of knowledge in math, reading, and science. Individual schools have the opportunity to evaluate their students’ performance on the global stage with the OECD Test for Schools based on PISA.