Do you want to know what someone is really thinking? Look no further than their facial expressions. The movements of our eyebrows, eyelids and the corners of our mouths betray information about our personality within minutes.

Scientific research has shown that the face is, indeed, the mirror of the soul. All people present a basic repertoire of facial expressions that betray a lot about how they view life. This book will teach you which facial expressions belong to which behavioral styles. This prior knowledge will allow you to improve every conversation, at home and at work.

Herman Ilgen has years of experience as a negotiator and a mediator. Working with the University of Amsterdam, he has been conducting research for over 12 years and developed the unique INSA Method that is now being used in a wide variety of settings by companies, government organizations and individual professionals.