We've started teaching mixed ability at KS3 this year for the first time. Initially I was really against the idea - I was worried I would struggle to cover the whole spectrum of ability but so far it seems to be going well and I can definitely see the benefits, certainly with weaker students. In a recent TES Pro magazine there was an article about mixed ability teaching and how lots of research shows the benefits of mixed ability teaching. Moreoever there is little to support setting by ability, even though the government and probably most heads would say that it's an important part of teaching. This got me thinking about mixed ability at KS4. At the moment we have 8 sets; I've had the 7th of these over the last 18 months and I have to say, if they were in a class with more able kids, it would be a much more pleasant environment, the behavioural problems I've had would be greatly reduced and perhaps the weaker students would learn a lot from the more able. However, I would be worried: weaker kids would find longer novels like To Kill a Mockingibrd potentially harder to access (a novel I've done with a top set this year whilst other sets did Of Mice and Men) and the choice of poetry for Controlled Assessment might be different to the poetry one might do with a top set. I'd be interested to know if anyone teaches KS4 mixed and how they find it. I imagine the planning is more difficult since everything has to be differentiated and I'd like to know how people manage that.