This book deals with the role of visualization in science, mathematics and technology education. It is based on both literature review and specific research data from different fields. It aims to provide accounts of types and characteristics of visual representations in school textbooks, to construct taxonomies and examples of their categories, while exploring their potential for students' learning. This book also focuses on students' experiences with selected visual representations of their textbooks and reveals which aspects of them students are able to discern and investigates the role of visual representation as a research tool and argues for the value of visual representations as tools of expression of students' own thinking and ways of experiencing the world.