Assessment may not be one of the most popular topics in teacher education courses, but it certainly impacts the teaching and the learning process in a very direct way. This book aims at introducing some key concepts about assessment theory, explaining how these concepts relate to English language teaching, analyzing traditional and more current assessment paradigms, exploring the necessary knowledge to design tests and other assessment tools, and refl ecting upon the role that assessment has in education. It is a book for teachers, academic coordinators, course designers and anyone who is interested in deepening their understanding of what assessment is and how it impacts education.