It is one thing having someone tell you how well you have performed in a task. It is quite another to review your own performance. The power of self-assessment was really brought home to me tonight.
One of my sons is learning to play the trumpet and, after an initial burst of enthusiasm, is finding it hard going. Tonight I decided to video him while he practised. Because he can't hear himself when he plays, he finds it hard to work out what he needs to practice. When he saw the results played back, he instantly became aware of the areas he needed to work on.
Children can be pretty astute assessors of their own work when given the opportunity. We adults just need to make sure they have the tools available to make it happen.