What if this is what magnificent work! Present the ACT therapy such detail and accessible to both is a real tour de force. The books are now available in English but enough of waiting finally a manual in French. Not only it is done, but in addition it is much more than a simple translation. The book Monestès Villatte and represents a real contribution in full for the ACT and psychotherapy in general. Even those who have read the books of Hayes Harris should learn a lot about how to practice the ACT, integrate tomorrow in daily clinical, but they also really understand how this works. From this point of view, the first chapter on the theory of relational frameworks TCR is of exemplary clarity. The chapter on the flexibility of the therapist is also very informative and emblematic of the ACT approach, not directive, flexible, functional. It is undoubtedly a book to have in the ideal library of any psychotherapist.