This eBook is for any developer who wants to learn more about user interface design. Maybe you are a solo developer who needs some pointers on how to get started with the visual design of your app. Or you are one of the coders on a small team and want to better understand the lingo and the concerns of the designers in your group. Or you are a developer moving into a supervisory position and now need to learn how to better communicate with stakeholders, creatives and coders about the look and feel of your apps. This document will provide a foothold into what sometimes feels like an alien world—the world of creative design, with the goal of making the unfamiliar understandable.