Nathan talks with Kat Stern, author of The Excludables, about understanding the children we exclude and why. "Any cursory reading of parental views indicates a preference for removing poorly behaved children from the classroom to minimise disruption to their own child's education" (Timpson review) but what is it that people want from exclusion? What is it supposed to achieve? Do they work? And what do we know about the general trends for the children who are excluded?