I had two interviews - one with the supervisor of the area and one with her director.
I was already pretty familiar with the supervisor, so, the interview process was somewhat informal. We talked about the job, why I would be interested, my qualifications, etc.
The interview with the director was a little more formal as she was new to the organization and didn't know me. We talked more about the specialist title, the responsibilities that come with the title, the work involved and her vision for the department. I talked about why I was interested in the job, my career aspirations, and why I was qualified.