How Are Teachers and Students Using Khan Academy?

What the videos and quizzes have done is help with tracking data, assigning practice exercises, and supplementing instruction into existing classroom structures. Researchers found a positive correlation with increased test scores, but little else to show that Khan Academy tools helped transform classrooms.

http://blogs.kqed.org/mindshift/2014/05/how-are-teachers-and-students-using-khan-academy/