The curriculum divided subjects into "common essentials" and "creative group activities." While "common essentials" required students to demonstrate mastery to advance, the creative activities allowed students to advance at different rates and there were no strict goals or standards of achievement. Rather than putting "gifted" students into higher level classes, the students struggling with schoolwork were put into special classes to address those individual problems. Most of the time, the struggling student received one on one help from a teacher. To this day, these classes and teaching sessions still exist, sometimes called "Study Skills" or "Resources".
The plan was widely imitated and led to shifts in curriculum focus across the United States.