Here you can find short summary by David Nicol and published by the Times Higher Education on their CAMPUS website. It suggests how one might guide students' learning by helping them activate their own internal feedback using information sources other than teacher comments. Taking this approach has the potential to significantly advance students' learning without any long-term increase in teacher workload. In other words, this is a method of scaling up feedback to any class regardless of student numbers, and of developing the students' capacity to evaluate and regulate their own learning without increasing the teacher's workload burden.  This really works!