In this graphic, the BadAss Teachers Association reveals a very important secret: How to get nearly 100% passing on state tests.


The secret is a word new to many of us: Backfill. The secret is NOT to backfill.


Public schools cannot take advantage of this secret because they have to admit new students as other students leave. They must “backfill,” the term used to describe the process of admitting new students in every grade as they move into the neighborhood or enroll to take empty seats. Charter schools have the luxury of not “backfilling,” which is why many charters have smaller numbers with each passing year.


In this interview with Eva Moskowitz, she acknowledges (around 11:55-12:44) that she does not backfill. Many start, few finish. That improves outcomes.