"Williams, Mercer and Ryan bring years of combined teaching and teacher educating experience to their writing task, and begin by first of all recognizing teachers' credibility...[They] find that elusive sweet spot between spoonfeeding and inaccessibility - with much of the reader-friendliness, in my opinion, attained with the provision of their explicit explanation of terms, concrete examples and accompanying activities. Williams, Mercer and Ryan talk to teachers to help them improve their practice - and do not lose their academic credibility in the process."