A core value of the Personal Learning Environment (PLE) is in facilitating reflection. "Facilitating reflection is not simple within a largely 'input based' curriculum where the main goal is to pass a series of prescribed examinations. The danger is that reflection is simply seen as irrelevant to the qualification driven motivation of many students within their school based learning (as opposed to outside school)." I've tried to describe 'curriculum' (if you will) as a process of engagement. There remain people who think this can be planned, as though it were a play. I don't consider that to be engagement. Anyhow, with those thoughts, enjoy Graham Attwell's longish paper on PLEs.