 Eye gaze tools are ways to characterize exactly where people are looking when they're engaging with most commonly a computer screen. We're using it as for a slightly different purpose and that is to try and track what students are doing with videos while they're playing so we can understand what role they play in student problem solving. What we're trying to understand is whether students who perform well, the so-called A students, have certain kinds of patterns of usage and students who struggle with the course might have different patterns of usage. So we don't have any definitive answer yet for what those patterns are but we're getting smarter all the time and what that's going to lead to is then our ability to give better advice to students about how to establish a pattern that works for them that is consistent with what we've seen in the experiment.