Autism is diagnosed entirely on behavior at the moment.
Whilst behavior is linked to and caused by one own internal experiences it is not the same as those experience. Unless on subscribes to a very strict behaviorist position it is, therefore, entirely possible that a given set of behaviors are caused by several different underlying metal states and experiences. To give a very simple example of this the behavior of seeming "distracted" could be because a person was worried, drunk, pondering something important or even really excited and preoccupied with thoughts about say a new lover. The same external behaviour could have multiple and very different internal experiences driving them.
SO what does this say for conditions like autism which are diagnosed on behavior?
Well it raises some interesting questions.
Are all autistic internal experiences similar or are some very different?

From reading WP I can surmise that our int. experiences are VERY different
If so then how different? Is it possible that some autistic people experience the world in a way that is so different from other autistic people that all they have in common is some shared behavior but little else.

GREAT point! i think ur right
My hunch is that there are probably several different underlying atypical brain structures that cause autistic behavior but the "what it is like to be" of those different brain structures may be very different. Perhaps this would also explain the very complex and vast variation found within the autism spectrum,

I believe that ASD is a collection of different disorders lumped into one because of our limited understanding of NeuroScience
Anyway just a Tuesday afternoon brain fart......