As we move into a new world of education, our goal should absolutely be mastery. Trying to group students by arbitrary aspects like "age" don't help education.

As we move into a new world of education, our goal should absolutely be mastery. Trying to group students by arbitrary aspects like "age" don't help education. Forcing students into more advanced topics before they are ready or simply telling them "You suck. give up", isnt't helping, either. I really like the schools the Khan Academy is working with that use the videos to describe and drill on the topic at home and classroom time to work through the problem sets where the teacher and other students can help. Combining the mastery of this article with the Khan model means any two students may not be working on the same problems or watching the same videos, but they are all working at the level they understand and are able to progress as a result.