This was for an interview to be in the Intel-PSG Rotation Program. About a month before hand, I had a phone interview with the main head of the program, which was a pleasant 30 min call. If saw fit, they would schedule an in-person interview.
This is divided up between 5 people for about an hour with each person, each one representing a different aspect of asking you and getting to know you. Only one or two would really get into a technical questions, still in a semi-casual environment.
Overall, along with communications in arranging the interviews, they were very able to make the interview as least stressful and intimidating as possible. Still, best to be ready on your material.