MESA, Ariz. (AP) — A teacher-in-training darted among students, tallying how many needed his help with a history unit on Islam. A veteran math teacher hovered near a cluster of desks, coaching some 50 freshmen on a geometry assignment. A science teacher checked students’ homework, while an English teacher spoke into a microphone at the front of the classroom, giving instruction, to keep students on track.

One hundred thirty-five students, four teachers, one giant classroom: This is what ninth grade looks like at Westwood High School, in Mesa, Arizona’s largest school system. There, an innovative teaching model has taken hold, and is spreading to other schools in the district and beyond.

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