Both professionals and students psychotherapists psychiatry and clinical psychology will find this book all the basic information on systemic therapy. This new form of psychotherapy is to apply in clinical practice the current concept of the human being understood as a living, while existentially autonomous and linked to their ability and communicative need in a complex system of relationships. Unlike Descartes, who in his "Cogito ergo sum" only asserts itself, Ludewig points the way to healing by an attitude of coexistence, living together, connection, dialogue, systems, etc.., By attitude, made a brief, perhaps could be expressed in a "Cogitamus ergo Sumu." In the sixties, at the height of information science cybernetics and general systems theory, a research group in Palo Alto moved these theories applied to the machine, the human realm, born and family therapy. In recent decades, systemic therapy has been enriched by the contributions of numerous investigations, spreading and claiming, further, the paradigm in various areas in the field of health. The development of second-order cybernetics and constructivism have broken the observation parameters of classical science: the look has become self-referential, objectivity is its setting, the truth is relative, therefore, is there a real reality ? At present, this pattern of thought has gone beyond a technical approach to families has become not only an epistemology that governs the field of psychotherapy, whether individual, couple or group, but has expanded their knowledge to other disciplines, providing a new perspective on construction of the world. The patterns of human interactions tend, in evolution, to complexify; urges then a model of psychotherapy that aims to change and problem solving, and provide a change in "look" that attempts on this complexity, enabling the deconstruction of old meanings to develop new materials, allowing the reflection through action and vice versa. This is where systemic ideas found fertile ground for the development, co-constructed in the therapeutic space that deed "only" leading to the creation of alternative realities to human suffering. Interactions collection. Epistemology and systemic manifestations, aims to bring together and integrate various of scientific research, both on theoretical grounds and in the clinical evolution that enable spread and this paradigm of contemporary thought. Marcelo R. Paul Watzlawick Ceberio