Sigmund Freud in 1910 founded the International Psychoanalytical Association (IPA) and since then have been a number of guidelines and psychoanalytic schools of thought, some very divergent from each other. In this book, Dr. Joan Coderch wonders whether one or many psychoanalysis, discussing the reasons to which we owe this plurality and sets out the reasons why, in his opinion, this is an inevitable and even fruitful. The author in-depth discussion of psychoanalysis dialogue with itself and with other scientific disciplines, including philosophy, philosophy of language, hermeneutics, scientific methodology and neuroscience, on the basis that in the current historical moment, marked by strong globalization, no branch of human knowledge can live and develop in isolation.