I have been studying and (was) trying to get my AS man figured out for years.
There are so many co-morbid (often seen with) symptoms with AS that it gets really confusing. Like the poster above (notcaaty), I agree with her comment about Dr. Tony Atwood, that the DSM does a horrible job explaining Aspergers.
I have found the easiest way to think about and describe Aspergers.
At the core they all have to have "Mind blindness" and a lack of "Theory of Mind". In layman's terms, understanding what the other person is thinking/experiencing is not only unnatural to them, but often times I have to take great strides at finding an example that happened to them, before they can comprehend how the other person felt.
There also seems to be a strong indication that there are processing deficits. Auditory and sequential. It appears most Asperger people I've had experience with, don't seem to be able to think things through, understand the complexity of thoughts, even when they can parrot them back to you.
They don't seem to be able to function in the vagueness and complexity that life functions as. Applying a rule or an idea to one area of thought, doesn't seem to be able to be modified in other context.
They seem to do far better with structured, linear and clear consequences as in a school setting because of that.
They may understand what losing their job is, but not the full complexity of how it ripples throughout their ability to function... i.e. not paying their rent, having to cut out eating out, entertainment cuts etc.
Then there are the co-morbid issues that all have varying degrees affecting the person, from nothing to an extreme affect.
Anxiety seems to be very highly associated, and it's probably easy to understand how if one was to think about how kids grow up. When you're always feeling that your on the outside looking in, doing the right thing would be very nerve racking.
Sensory issues, sounds, smells, touch etc.
Low muscle tone (accounting for the clumsy and odd "gait" issues. My guy also has hand tremors.
OCD, which they say doesn't show up until into the adult years)
But I would see the OCD closely related to the rigid thinking and routines that some Asperger people have. In that it's their comfort zone and feeling safe.
OCD's rigid thinking I have also noticed as attaching to ideas or plans quickly and despite logic or reasoning, still it's hard for them to be more flexible. You might see this with a boyfriend and you might try to arrange to met for lunch, but when you start vetting ideas, he is likely to attach to the first one.