Interaction design has many dimensions to it. It addresses how people deal with words, read images, explore physical space, think about time and motion, and how actions and responses affect human behavior. Various disciplines make up interaction design, such as industrial design, cognitive psychology, user interface design and many others. It is my hope that this book is a starting point for creating a visual language to enhance the understanding of interdisciplinary theories within interaction design. The book uses concise descriptions, visual metaphors and comparative diagrams to explain each term's meaning. Many ideas in this book are based on timeless principles that will function in varying contexts.