The preface has some inspiring words and what certainly seem like keen insights into the development of teachers. Jackson defines what she calls the "master teacher mindset," a way of thinking about and looking the craft of teaching which exemplifies really effective teachers. The defining point seems to be that instead of looking for hard-and-fast answers to questions that arise while teaching, a master teacher understands that asking the right question is the more important act (2). She suggests that all teachers can be master teachers with practice, a sentiment with which I certainly agree.
The introduction reminds me of nothing so much as a quiz in Cosmo. (Erm...or so I'm told.) You answer the questions, you give yourself a score based on your answers, and then the test tells you who your true love is, or what your ideal profession is, or whatever those tests are supposed to tell you. Or, in this case, what level your teaching practice rests at. I rank in as a practitioner, the third stage of four in this hierarchy of professional development, by exactly 1 point. As you can probably tell by my tone, I'm always a little skeptical of such things; it's like a horoscope. They're vaguely enough worded that they could apply to anybody. Some parts of the "practitioner" description are very accurate, but others are not. (I flatter myself that I have a pretty high awareness of both my skills and areas of needed improvement).
Having said all that, Jackon's primary objective in giving the quiz seems to be to initiate self-reflection and increase self-awareness. This reflection seems like it's going to be a key to Jackson's book, and I don't think it's something that can be over-practiced. So despite the teen-magazine feel of the beginning of the book, Jackson's purpose in the book seem to fit pretty tightly to my motivation for reading it.