I was brought in for a first round interview. A few days later I was contacted to schedule a "field day" which is basically the second round of the interview process. You go out in the district with the supervisor and basically meet all of the other counterparts to your district that you would be working closely with. This is their opportunity to ask you questions (usually the same ones) and to see if they also like you. It is a very long and overwhelming day but it does allow you to learn more about the position.