I sent in my resume and cover letter and was contacted a few days later, to schedule a phone interview. It was within half an hour, and I was mostly asked about my previous work/research experiences and questions I had about the project, and what I was interested in working on. I was very surprised when I was contacted a couple weeks later with an offer, because I thought there would have been another interview or technical test. It could have just been my manager though, because I know that another intern had a panel of interviewers in person, so I guess it varies.