I have always grouped by ability and used writing ability as the main guide. For some things I might mix them up a bit but it is usually by ability. I sit with the least able. I know that is probably a dated way of doing things. In September I want to be brave (or modern) and NOT just use abiilty. What do others do and where to you place you children who cannot write independently. I will have a largely low ability Year 3 with several children having been given a Level 1 at the end of Key Stage 1. Behaviour wise I think (for the first time in quite a while) it is not much of an issue. Only 1 needs to be tied up with shoes removed (so to speak but not literally - honest but think he's more a problem verally - just imagine having a gobby Year 10 - he's actually 7 but thats the standard of his language).