In short, this means to give to the testers what is theirs, but give the freedom to think back to our learners. In the Guardian article Give Your Students the Freedom to Learn, Matthew Bebbington talks about a strategy used by companies like Google for increasing employee engagement.
They allow workers a certain "freedom" for focusing on personalized approaches to working on problems. Essentially, they have carte blanche to work on whatever they wish with whoever they wish. The result is a heightened sense of ownership of the problem, and a creative approach to solutions.
Of course, this elevates critical thinking capacity as well. There's absolutely no reason why the same thing couldn't work in a classroom.