As data becomes more prevalent in the media ecosystem, there are many more content companies touting their own versions of closed loop data systems in time for the Upfronts. But just like trying to define programmatic or even define television, closed loop applications can mean different things to different people. I wanted to know more about closed loop applications and how they are impacting the measurement arm of the industry so I asked Megan Clarken, Nielsen’s President of Product Leadership, what is going on.