This document discusses transitioning an app to iOS 7 design principles. It emphasizes that iOS 7 design is not just "flat design" but rather focuses on user experience and interaction. Developers are advised to rethink how their app presents content by drilling down into specific tasks and spreading content across screens in a hyperfocused way. The document also outlines how the developers of one photo editing app interpreted key iOS 7 design concepts of deference to content, clarity in UI elements, and use of depth through layers and motion to improve the user experience.