This edition of Sigmund Freud's Complete Works makes the translation of a foundational work available to Spanish-speaking readers and scholars. To this exhaustive work are added the revision of the texts by Jacobo Numhauser and their chronological ordering, according to the criteria of the James Strachey and Anna Freud edition; the critical apparatus, which helps to clarify concepts and references, and an iconographic selection of the author, as well as illustrations related to his work. Likewise, for the first time, Sigmund Freud's complete Works include a fourth volume of indexes - alphabetic and thematic - that will serve as a guide for those who wish to exhaustively study the scientific vastness of this work.