The book covers psychological and social aspects of user/s, interaction styles, user requirements, design approaches, usability and evaluation, traditional and future interface paradigms and the role of theory in informing design. The topics will be grounded in the design process and the aim is to present relevant issues in an integrated and coherent way, rather than assembling a collection of chapters on individual HCI topics. This book is intended for undergraduate students in computing, graphic design, web design and multimedia.