This book is about communication. We are living in an era when essential communications and services are suspended, interrupted, and disturbed- yet unwanted communications- the junk mail and unsolicited telephone calls- continue to pour into our lives. The focus of this book is on extra-linguistic messages- nonverbal expressions that are part of every communicative/behavioral event. It is a collection of authors who are seeking to discover the structure of behavior in human communication and interaction with each other and with their environment.