The present paper approaches, from a legal, doctrinal and jurisprudential perspective, the concept and extent of the "Own Acts Doctrine" or "Venire Contra Factum Proprium Nulla Conceditur" as a general principle of what it implies as a right, according to different law systems and, in particular, according to Argentinean law. It settles and analyzes the requirements for its due application in each precise case and to prevent therefore any discretional uses, acting either as a shield against inappropriate pretensions or as a device to silence an exasperating judged pretension, which, paradoxically have been given to this valuable tool founded on good faith. [ABSTRACT FROM AUTHOR]