This manual is a real mine for the therapist. The theoretical content is extremely rich and accessible at the same time (which is rare enough to be stressed!). From the MBSR, I was already quite familiar with meditation but I did not know well the ACT. This book opened me new perspectives. It is very well written, easy to read, with a very large amount of exercises, metaphors, very subtle clinical vignettes. I think keep it on hand for a while because I think he must return again and again as it is rich. I really recommend to all psychotherapists, any tendency confused.