This book comprises a variety of breakthroughs and recent advances on Human Computer Interaction (HCI) intended for both researchers and practitioners. Topics addressed here can be of interest for those people searching for last trends involving such a growing discipline. Important issues concerning this book includes cutti- edge topics such as Semantic Web Interfaces, Natural Language Processing and - bile Interaction, as well as new methodological trends such as Interface-Engineering techniques, User-Centred Design, Usability, Accessibility, Development Meth-...