@Letseatgrandma for my DD effect strategies that work include
Choices so "would you like to do this piece of work or this one?" Both would be within the expectations of what she needs to do but she is getting the choice to choose which
Wondering statements instead of commands ie "I wonder how we might.." or "I can't quite see how to do.." instead of "do you work".
Commenting on the work rather than her is also a good one. "This is a really good sentence" rather than "you have written a good sentence"
She can't deal with ambiguity so if she asks a question such as wanting to know what is happening next then showing her on her boards is crucial rather than telling her to focus on what she is doing at the moment or 'i don't know'.
It's little adjustments that really make the difference.
Yes it has hit the fan at school a few times but all purely when her plans aren't followed and always by unfamiliar staff. I know she is fortunate to have full time 1-1 which allows for the adjustments but it genuinely makes the difference between a child who is absolutely fine and doesn't need specialist to one who is violent and can do awful things.
The hardest thing they had to get used to is that she only appears to have the two emotions fine/explosive so we have really had to make sure that everything is in place consistently particularly with known triggers regardless of her appearing fine because she will go from one extreme to the other. At one point they were only doing things like breaks or ear defenders once she was already past it. Once the support staff started to recognise that better it has massively helped. It's too easy to think they are fine and not do something so then suddenly they aren't fine..
I'm thankful school have always fully acknowledged that when she has been violent that it isn't her as such and we can always easily identify where it has gone wrong in the lead up to an incident.