To myke and agarand8:
As an aspie going through this process, I couldn't help but obsess over it so I've spent many sleepless nights looking for this kind of information and this is what I've gathered so far:
Our applications go through a few "default steps" when they get to our Visa Officers desks after being in queue for a few weeks or months (depending on your VO) and the first step is the eligibility check, this is when they try to determine if your relationship is genuine or not. And after studying your relationship proofs, they will decide if additional proofs or if an interview is necessary to proceed with the application. If so, they will send you an e-mail and place your case into the interview queue, your status will be changed to '!in Process' after the interview. If an interview isn't required, your status will also go to 'in Process' and they'll move on to the background and security check.
I understand that the system isn't always consistent, they don't always update ECAS, and it also changes from VO to VO and from time to time, but I've seen many cases that follow this pattern. Including my own.