Thirteen years ago, Minnesota was a state with no academic standards in mathematics and science and what some observers said was a mixed record in grounding students in crucial academic content, such as number skills and algebra. Since then, the state has set clear guidelines for schools in both subjects, and it also appears to have tuned up what…

Almost every time the results of an international test of student achievement are released to the world, the reaction among the American public and policymakers is like that of a parent whose child just brought home a disappointing report card. Elected officials and academic experts question where U.S. students fell short: Was it their curriculum,…