In a world where technology and connections are an integral part of our lives, the relationship between us and the multimedia objects assumes an increasing importance as these allow us to communicate and interact with other people every day. This discipline bases its success on the needs and desires of the people, designing artifacts that meet the expectations of users for which they were designed, providing them with an adequate dose of satisfaction. Its purpose is to try to improve the interaction between users and objects on their daily routine, providing designers with the tools necessary to achieve the intended purpose, and users an easy, intuitive and satisfying way to make use of the object itself. This book stands as a useful tool to understand the basic principles of this discipline in order to obtain a useful and proper design.