Type Talk is a very insightful book that helped me to understand myself and those that I work with more clearly. I was not surprised to learn that my "type" is INTJ. What was surprising and helpful was finding out what effect each of those characteristics within my profile has on my interaction with others at work. The Type Talk personality theory is built around four tendencies that are natural parts of an individual's personal traits. Each individual has a natural propensity to lean toward one preference in each of the following pairs: Introvert or Extrovert; Intuitive or Sensing; Thinking or Feeling; and Judging or Perceiving.