The full title Quiet: The Power of Introverts in a World That Can't Stop Talking
The extrovert is applauded and encouraged. The other one third of the population of introverts is encouraged (sometimes forced) to become an extrovert. Doesn't work. There is the person/child who doesn't volunteer or talk in groups. That becomes a stigma and a bad report to the child's parent.
This book describes the introvert compared to the extrovert. Examples of well known introverts are included throughout the book. With research of brain function through imaging, the author relates that introversion can be observed in the brain. Further research and long range studies concur that there is the prescence of an introvert personality.
As I read Quiet, I could see myself as the shy and introverted kid that grew into a less shy but still introverted adult. In order to succeed in many business situations, the introvert has to take on the role of the extrovert. I also did that. It isn't easy and it is physically draining.
The author includes a chapter for the teacher and the manager where the author describes the ways to deal with the introverted individual.
With research, interviews of introverts and examples of well known introverts, Cain (an introvert) presents a very readable book on the subject of introversion.
For a brief overview of the author's thoughts, watch the TED talk Susan Cain's The Power of Introverts