This book aims to encourage and facilitate the use of written communication in psychotherapy. Although it is designed from family therapy, where the existence of multiple partners, actual or potential, suggests the usefulness of the cards, its proposals are generalized models and contexts of individual and group psychotherapy. Therein lies the intention stimulating, encouraging therapists to write letters freely, adapting to the conditions in which it develops its work. This book provides an important methodological content and many examples from clinical practice. The idea is that, as with any psychotherapeutic activity, technique and artistic inspiration from the hand are given the benefit of the richest intervention.