This book is mainly a summary of research by more than 10 years in the field of multimedia and virtual reality, which fits in the broader interests of the utilization of psychological theory to improve the process of designing interactive systems. Extending Sutcliffe's views on the design process for more complex interfaces that have evolved in recent years, this book: * Introducing a background for surveys and user interface design problems and previous multisensory HCI research in these areas; * Explain the basic psychology to design multisensory user interface, including the Interactive Cognitive Subsystems model cognitive; * Describe the elaboration of Norman's action model for multimedia and VR, this model relates to cognitive ICS model, and explain how the model can be used to predict the design features needed for successful interaction; * Provide design process from needs, user and domain analysis, to design representation in the media or virtual worlds and facilities for user interaction in it; * Includes usability evaluation for multisensory interface by extending an existing well-known HCI approaches heuristic evaluation and usability test observations, and * Featuring two specific application areas for multisensory interfaces: application of education and virtual prototyping for design improvements.