By using Teaching Games for Understanding (TGfU) as a catalyst for thinking about ontological and epistemological issues in Physical Education, the teachers, researchers, and authors of this book have become ambassadors for new ideas that challenge some of our entrenched educational values. We are proud to be able to share some of their pioneering research, which we believe will be of great interest to others in the field who are interested in constructivist, student-centred, and holistic approaches to teaching and learning in games education.