The Los Angeles Unified School District and its teachers union have reached what is being called a “historic” tentative agreement to incorporate student test scores into teacher evaluations for the first time ever, joining Chicago and a growing number of other cities.

KPCC reports that under the agreement, teachers’ final evaluations will include student results on the California Standards Test from the previous year or years, as well as the Academic Growth over Time measure. They will also be judged on students’ California High School Exit Exam scores, graduation and dropout rates, and classroom observations, among others.

Individual teacher Academic Growth over Time scores — which rely on a formula that estimates how much a teacher helps a student achieve while controlling for factors like income and race — will not be used in the final evaluation. The measure will instead only be used for feedback and to improve instruction.

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