Personology is the completion of the revised 4 temperament model first presented in Portraits of Temperament ( 1987 ), and used in Keirsey's later works. The 8 Jungian function types are replaced by 8 intelligence types. The intelligence types are the 4 temperaments, each having 2 subtypes, and minus extroversion and introversion. Then each of the 2 subtypes is itself split into 2 more subtypes called proactive and reactive, for a total of 16 types.... This books completes the explanation of Keirsey's model.
But, this book is not the one for the general public should buy, that book is Please Understand Me II. I started with the original Please Understand Me, and it really helped me understand my co-workers, who with one exception, turned to be all the SJ temperament. Both understand me books have large sections on mating, children and children from a 4 temperament viewpoint This book is too specialized! It was a birthday present, I would have had to have given it some thought, if I were buying it myself.