First AIDS (Anticipation and Intervention Defuse Situations)

1. Learn to identify which situations are difficult for him and be
aware of the warning signs leading to difficult behaviours.
If you know a particular situation will be potentially difficult,
for example, a party or a shopping trip, use whichever shields
are appropriate to the situation. Help him to anticipate the
situation by using a social story to explore possible reactions
and ways he might cope.
Try to give him some control over the situation by setting a
time limit for it and by organizing breaks during it.
As soon as you notice the early warning signs try to alter
things by changing the environment. Do this even if you cannot actually identify the cause of the problem.
It may be helpful to suggest he spends some time in his room
or in a quiet place, listening to music or doing an activity you
know he likes. If you do this while he is still behaving well, it
will reinforce his good behaviour. In most cases this alone will
defuse the situation.
If you are too late to intervene in this way or if the situation
deteriorates so that he is wrecking things or is in danger of
hurting himself or others you may need to try using other
methods.