The book looks at the most common mistakes an ACT psychotherapist makes when dealing with clients - sending conflicting messages, talking and explaining instead of practicing, being overly enthusiastic, striving to be a "good guy" or a good listener, paying increased attention to one process and neglecting others. The chapters of the book are based on real examples of dialogues between a psychotherapist and a client, after which the author analyzes errors, gives feedback and shows where improvements can be made.