This text provides a comprehensive and authoritative introduction to the burgeoning discipline of Human-Computer Interaction for students, academics, and those from industry who wish to know more about the subject. Assuming very little knowledge,the book provides an overview of the diverse research areas that are only gradually building into a coherent and well -structured field. It aims to explain the underlying causes of the cognitive, social and organizational problems typically encountered when computer systems are introduced. It is clear and concise, whilst avoiding the oversimplification of important issues and ideas.