Two phone interviews. One with human resources, one with the hiring managers, and one in-person with the director. You will be informed quickly if you got the job. Process was simple and you will be informed of the next step in the process.

3M probably has one of the longest processes of interviewing. on average one interview 5-7 people from HR to hiring managers to VP. Mostly it was one on one in person, but in one case on the phone. There was also a knowledge test at the end. Everyone during the interview was nice and casual!