This is a very dense, but readable presentation of the Theory of Knowledge curriculum. Along with Sue Bastian's text published by Pearson, I use this van de Lagemaat in my Theory of Knowledge classroom. Each chapter begins with a set of quotes which correspond to the particular chapter's topics, and each chapter closes with a set of linking questions which enable people to extend the chapter's implications to considerations of other aspects of TOK's Ways of Knowing or Areas of Knowledge.
TOK is a very amorphous part of the IB curriculum. Students as well as other IB teachers always ask "What is it?" Now that the International Baccalaureate Organization is mandating greater familiarity with TOK and greater attention to integrating aspects of TOK into every IB class, this would be a helpful text for every IB teacher to have on the shelf. Not everything will be applicable, but material related to the "Ways of Knowing," as well as the individual chapter or chapters on selected "Areas of Knowledge" should be read by IB subject area teachers so that they begin to recognize how TOK brings together all the separate strands of the IB program and attempts to weave them into a seamless garment.
With the changes coming to the TOK curriculum set to go into place in 2015, I will be eager to get my hands on an updated copy of this text and the Bastian text.