They call you in and test you. Interview is not that difficult. Once you are in the system, you generally don't have to come back for the next assignment, unless it has been a long time.

One on one interview in small conference room. They made me feel very special and made the job out to be something it wasn't (after further research). Seemed like they were more interested in placing me so they could make money than honestly thinking I was a good fit for the position.