I applied through a recruiter. The process took 3 weeks. I interviewed at Veris Group (Sterling, VA) in Mar 2014
Interview
The process started with a phone screen and writing exercise. They put a lot stock in the writing exercise, so make sure you take it seriously and try and do a good job. After that, I had a couple of face to face interviews with managers in Sterling. They are very knowledgeable, so be prepared.
Interview questions [1]
Question 1
They asked about control groups and which control groups I found to be the most difficult. This is something you should be prepared to discuss. They also will discuss the writing exercise.