I expected to love this book. A personality assessment that can be done objectively? Based on behavior? So that you can actually label the people around you and alter your behavior accordingly?! This is the major downfall of Meyers-Briggs and similar assessments and so I had high hopes for People Styles.
The information seems solid, and the criteria are simple enough to understand. The authors even include a section on how to flex to each type for every other type--a clear cut practical guide.
The problem comes in identifying your own style and, sometimes, those of the people around you. By my own assessment, I am an Analytical. By reading the descriptions, I sometimes veer into Amiable territory. According to my husband's assessment of me, I'm an Expressive. According to a coworker's assessment, I am a Driver. So, I'm all four types?
Either the test is flawed or am I already a master Flexer, altering my behavior to match the situation. So much for the "your type is fixed and will not ever permanently change" notion of the authors.