After an Editorial Note, the complete Italian edition, with a new translation, of Sándor Ferenczi & Otto Rank's essay of 1924 The Development of Psychoanalysis, written in 1923, is published (only chapters 1, 3, and 5, had been previously translated into Italian). Also an Afterword written by Michael Turnheim for a German edition of this essay published in 1996 by Turia & Kant of Vienna is translated. The Development of Psychoanalysis represents an important milestone of the debate on the theory of psychoanalytic technique, and shows how already at the beginning of the 1920s some issues that today are discussed within the psychoanalytic movement were already well known.