The Third edition of this well-received and widely used Handbook brings together an entirely new set of chapters, to reflect progress and new themes in the ten years to 2022. Building on the established structure of the first two Handbooks, the four sections focus in turn on: philosophy, history and theory development; fresh perspectives on policy and policy development; emerging programs and new approaches; and re-imagining lifelong learning for future challenges.The Handbook stimulates readers with fresh and timely insights, while exploring anew some enduring themes. New topics and themes...