Most of us spend 3 hours and 8 minutes per day staring at our smartphones in a universe filled with millions of applications and websites attempting to capture and retain our attention. And the apps we spend most of our time on have one thing in common: they've successfully created an engaging and intuitive user experience. In fact, more and more companies are now realizing that user experience is the true competitive advantage which sets the best apart from the rest. However, as we all know, it's easy to champion the user experience in theory, but in practice, product managers and UX designers must account for an ever-rising number of complexities making their way into every project. These 6 UX principles will help mobile app development teams ensure that the final product is useful, usable, and engaging.