Case study and group interview, after the initial phone screening they ask about your background and experiences. The panel interview is supportive and constructive. If you get stuck be honest and they will provide information.
Interview questions [1]
Question 1
what is your typical process when you get a new project
I applied through university. The process took 3 weeks. I interviewed at Wunderman (Washington, DC) in Dec 2015
Interview
Fairly Easy. I had a group interview with a group of 15 other interns. Then I was asked back for a follow up interview by myself where I met the Analytics Department 2 weeks later. They offered me the internship 2 days later.