This document discusses user experience design and user-centered design. It defines user experience as how pleasing a product is to use, user experience design as the process of improving usability, accessibility and satisfaction in a user's interaction with a product, and user-centered design as a methodology ensuring user-friendliness through research, design and evaluation. The document outlines the research, design and evaluation phases of user-centered design and discusses techniques used in each phase such as card sorting, wireframing and usability testing. It also covers benefits of usability evaluation like iterative refinement and defines user acceptance testing.