Patricia Harris Ph.D. 
What Is User Experience Design? [PDF ebook] 

Apps and programs are taking over the world, and that’s a good thing. However, sometimes we open apps and programs and have trouble figuring out how to use them. This is a sign of poor-quality user experience (UX) design. Computer users would rather use apps and programs that aren’t difficult to figure out. UX designers focus on the flow of tasks through a program and try to make everything feel intuitive. In this book, readers learn about careers for UX designers as well as how UX design extends to hardware development.