Everyone should read this. Well, not everyone. But everyone involved in education, especially language education and more especially those involved in foreign language teaching and those who teach writing. The Hallidayan genre approach deserves to be much more widely known. And applied.
The book is rich in theory, and rich in very clear practical approaches to applying it. There are times when you have to take a step back from the text and grasp the fact that the authors are providing practical advice. I wondered at times if the book might have driven home its practical side by using a Step 1, Step 2, Step 3 etc format.
But this is not a book whose writing can be criticised. I would like all my trainees to read it, absorb it and apply it. I wish I had come across it earlier.