This author obviously has a deep scientific background about habits (she has 49 pages of footnotes). She explains fully how we are all programmed by habits, both good and bad. She points to countless studies (ad nauseam) of how our lives are affected by habit, and how good habits lead to a less complicated, more fulfilling life. Great, compelling research. But, this is where I think this book looks so much more like a doctoral thesis than a user's guide. She gives scant examples. In the rewards chapter, for instance, why doesn't she give us a list of possible rewards? Why doesn't she give examples of where people, who she says are the greatest source of 'friction'(you have to read the book to understand this term) come into play with our habits and what we can do? Her theory is that there are three components to changing a habit (Context, repetition, reward), yet I can find only two examples where she takes the reader through the complete transformation using the components, and neither of them shows how to eliminate a habit, but only create a new one. If Dr. Wood wants us to change our lives (and the world) by changing our habits, she needs to edit this book to essential 'why's' and then take the reader into 'how to's." For all of those people who gave this book 4+ stars, I'd like them to write a review in a year.