The publications in these two volumes reflect the author's work over the past ten years in the development of teaching thinking through philosophical enquiry in primary and secondary schools. Philosophy as an essential aspect of education for all young people was first considered in the US by Professor Lipman in the early 1970s, and is now established in more than thirty countries around the world. The publications presented here represent key documents in the author's involvement in the development of a curriculum for teaching thinking through philosophical enquiry in UK schools. The publications are organised under two themes relating to teaching thinking and philosophical enquiry which are seen as vital elements of children's learning, and are presented as a contribution to curriculum development in schools, including the developing of pedagogic methods and teaching materials, and as a contribution to the professional development of teachers. Fifteen sole-author publications are included, comprising two books, excerpts from four books, and nine published papers. In addition to the publications this volume contains the author's commentary which provides an introduction to the publications and an assessment of their significance.