'I have used this book in all its editions since first publication with my undergraduate and postgraduate students. It is a core text for all the students, because it provides the detail they require at an academic level. Importantly it is a book for the practitioner to use too. This is why we use it on our postgraduate practitioner programmes – where we actually buy the book for the students as we believe it is that important. No other text comes close and literally thousands of our graduates have benefitted from it in their subsequent careers: written by the specialist for the specialist.'