I have read several introductory books to acceptance and commitment therapy in both French and English and this practical guide is the one that was most helpful to me as a practitioner. The simple but very effective matrix concept (developed in the USA by Kevin Polk) underlying theme throughout the book to introduce the different processes ACT (demergers, self observer, acceptance, committed action values, the present) and integrated in a coherent and easy to understand for the client and the therapist. As in her previous book for the general public, Benjamin Schoendorf supported by the clinical experience of his two colleagues took up the challenge of writing a simple, but very effective and clear tinged with compassion for the human condition and the customers. The dialogues allow many to see in action, the use of different intervention techniques. But beyond technology, this guide brings out the importance of the therapeutic relationship not only as a place of education and training but as living experience of meaningful human contact whose loss or distortion is often the source of Experiential avoidance patterns in people suffering from personality disorder. A book of jewel for get absolutely any interested physician to learn to methodically ACT.