The research literature over a long period of time has been crystal clear that
one of the most powerful movers of the needle in any learning environment is feedback.
And some of the best thinkers about teaching and learning will say over and over and over again
that feedback-rich classrooms are classrooms in which students really learn.
And so the ability to generate a feedback-rich classroom, the ability to provide
learners with high-quality feedback has for a very long time
been one of the primary focuses of good teaching and learning.