Just looking for some advice really.
My ds 3.8 (ASD with severe speech delay) has real problems with attention and can opt out of everything so quickly - even when we have reinforcers that he loves. I can't even assess what he knows and doesn't know because I cannot get his attention for any decent length of time. When he does attend he shows some really nice skills but getting that attention is a nightmare. 
Any ideas would be really appreciated!!