The challenge project was challenging (as the name suggests) - it covers a lot of ground for having such a short turnaround. Be ready to devote some pretty serious time to it. Otherwise, there weren't any "trick" or surprise questions - just a good mix of behavioral, situational, and analytical.
What are the product trade offs you would consider with your proposed solution?
A root cause analysis question
The usual suspects. My resume experience? Interesting campaigns? Why Digitas? Talk about something not on the resume?
How well do you work under pressure? Tell me about your background?
Is it better to be smart or to work hard?
Why do you want to be a project manager?
What is your leadership style when managing a team?
Tell me about yourself
Why you want to switch ?
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