As Kansas City, Mo., students return to their age-assigned classrooms this fall, they will begin to take assessments in math and reading—tests that will determine their mastery of specific skill sets and, ultimately, where they will be placed.
Instead of simply moving kids from one grade to the next as they get older, Kansas City schools will begin grouping students by ability. Once they master a subject, they’ll move up a level. This practice has been around for decades, but was generally used on a smaller scale—in individual grades, subjects, or schools. Kansas City is believed to be the largest U.S. school system to try grouping by ability.

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