Credit: Alison Yin / EdSource
Accountability has been a central plank in California’s — and our nation’s — school reform efforts for over two decades. Over nearly that entire period, California has been criticized (including by me) for being one of the few states that does not include a measure of student achievement growth in our accountability system. The current approach, exemplified in the California School Dashboard, rates schools on their average performance levels on the state’s standardized tests, and on the difference between the school’s average performance this year and last year.
But the state doesn’t have, and has never had, a student-level growth model for test scores. Student-level growth models are important because they do a much better job than the state’s existing measures of capturing school effectiveness at improving student achievement. This is because growth models directly…
