This book is one of the foundation stones of NLP. First published in 1975, it was designed to give an explicit set of tools to help psychotherapists be more effective. The book is largely concerned with language systems and was the definitive work on the Meta-model until The Secrets Of Magic came along.

These seminal works in neurolinguistic programming (NLP) help therapists understand how people create inner models of the world to represent their experience and guide their behavior. Volume I describes the Meta Model, a framework for comprehending the structure of language; Volume II applies NLP theory to nonverbal communication.