Being able to look at large sets of data and use visualization as a tool for discovery is a common task that many people who work with data do on a daily basis. A computer scientist should have decent facility with using tools opening and browsing large datasets, and doing some cursory exploration to see what’s there. The computer scientist should be familiar enough with the tools to, over time, develop some instincts about data, how it’s collected, the kinds of formats it comes in, and how that affects what can or cannot be done to visualize it.