As a foundation supporting Jewish day schools and overnight camps, AVI CHAI has always been eager to see the maximum number of participants enroll in our various professional development programs. “Filling the cohort” would obviously benefit a large number of institutions, thus increasing the impact of our philanthropy among Jewish youth. But cohort-based learning is not merely a matter of numbers. Early on, we learned that fashioning a group of professionals into an “intentional learning community” profoundly deepens the learning and enhances its durability.