This document discusses the growing dominance of mobile devices and adoption of mobile-first design approaches. It notes that in 2015, more Google searches took place on mobile devices than computers in 10 countries. It also reviews market share statistics showing Android and Apple's dominance in the smartphone market. The document then examines how consumers are using mobile devices more, spending over 3 hours per day on them compared to 5 hours watching TV. It also explores how larger smartphones are reducing tablet usage. The document advocates for mobile-first design, noting users want fast, appropriate, and engaging mobile experiences. It provides examples of how MTV improved mobile metrics using responsive design. Finally, it compares mobile apps to responsive design, outlining 10 questions to determine the best approach