Process started with a 1-on-1 interview at my university, which was exceedingly casual and lasted about fifteen minutes total. Second round was a two-day event that included a dinner with mostly HR employees and a few current ISR's sprinkled in the mix. Very nice and all expenses were paid. The second interview followed the dinner, after a tour of the facility, a few HR presentations, and a nice lunch. Second interview was conducted by one of the HR employees from the dinner and another, younger employee. Questions ranged from technical electric to hypothetical role-playing in a support scenario (read: sell me this pencil, etc). Second interview lasted about an hour, though it felt I was pushed out at the end. Overall, a very nice experience with an impressive company.