This is an exciting new textbook for students and teachers of the International Baccalaureate Diploma, written and developed by practising IB teachers. It provides comprehensive coverage of all the Ways of Knowing and Areas of Knowledge. It engages students in critical thinking relevant to their other courses and their life outside the classroom. It enables clear links to the Learner Profile, the IB core values and all the IB hexagon areas. It offers exam-style assessment opportunities using questions from past papers. It offers guidance on the Prescribed Essay and the Student Presentation.