Very straightforward interview process. You're basically a connection from the client to Nielsen's vast resources of services and products. If you're on-site your a salesman who can do some data analysis, so the interview questions are based on this.
I applied online. The process took 6 weeks. I interviewed at Nielsen (Markham, ON) in Jan 2011
Interview
Phone interview, in person interview with HR (Basic behavioural questions), take-home case study, in house logic test, interview with 2 hiring managers and presented case study
Interview questions [1]
Question 1
How would you deal with a client not accepting your recommendation?