Just a pondering really. I found my old Year 9 maths book the other day and, on flicking through it, found very little marking and certainly nothing beyond ticks for right answers. I'm a fairly capable mathematician and took it through to a-level even without this detailed feedback. I'm wondering what studies have been done in to the impact of detailed teacher marking? Does anyone have any links to facts or is this simply something that teachers spend many hours doing without a true necessity? Would simply glancing at books to get a feel for understanding of the class and a well done at the bottom get just as much progress as detailed marking? I'm aware this may have some issues regarding self-esteem and drive of pupils but want to know if there have been full studies in to the impact.