First was a talk at the career fair with two full time engineers, a mechanical and chemical engineer. I asked them some question about the process there jobs and then just small talk. A couple weeks later I was emailed about a on-site tour and was given a date time and schedule. The on-site was a hour and a half panel interview followed by an informal interview lunch and one last interview with the plant manager. Following the interview was an hour and a half long plant tour. In all I was on site from 9am to 3:30pm. This was the last step in the interview process.