When under stress, many of us will work on the fight, flight principle and our responses might not be the best when viewed with a calm head, so it stands to reason that we should be focussing on calming children down first, rather than pumping them up with more stress and confrontation.
When I mark children's work, I always tick the stuff that is ok and put a dot where they haven't got it right. The kids pick up on this really quickly and ask what the dot is for. My response is simple ' I have started to make a tick and wanted you to check if you had it right first' When the child has a second look and made the necessary correction, I complete the tick and avoid the negative judgement inherent with a cross. Also avoid using red pens, try using pencil, it shows trust
With SEBD children, this step is really important if you don't want to see work screwed up or worse still, have a child who refuses to put pen to paper lest they should make a mistake.
I always think if it works with the most challenging, it will also work with the rest