This report, based on the results of a large-scale, nationally representative survey, documents for the first time exactly how big those changes are. The survey is the second in a series of national surveys of children’s media use; the first was conducted in 2011 (Zero to Eight: Children’s Media Use in America, Common Sense Media, 2011). By replicating the methods used two years ago, we are able to document how children’s media environments and behaviors have changed.