In the new OFSTED criteria fro lesson observations we are supposed to show that students have progressed through the lesson. I can think of quite a few ways of doing this however they are for the most part based on the fact you show that the kids know nothing or very little at the start of the lesson. Two problems with this as I see,: 1. You are at the start of a topic with a newish class and they seem to know most of what you are about to teach so blow your lesson plan out the water. 2. One or two of the brighter ones cotton on easily so the bit of extension work you planned isnt going to fill the lesson. You want,/ need to cater for all your studetns but you could end up teaching three different lessons to the same class at once in order for them to show progress. Suggestions on how to combat this because it seems you need to show that the kids know nothing at the star of the lesson, which if you are mid or at the end of a topic is clearly not the case.