The so-called ‘competition advocacy’ is one of the innovations incorporated to the anti-trust Colombian Law. Pursuant to section 7 of the Law N.1340 of 2009, regulation projects which may affect market’s competence must be send to the local anti-trust authority in order to obtain a previous concept about its convenience and its effects. Thereby, the local enforcement of law is complemented by a previous intervention that theoretically improves the content and the impact of local rules and dispositions. Nevertheless, the application of this institution is far way from being peaceful or undisputed. According to recent positions, the local regulation of the competition advocacy is full of gaps and fissures that impede its adequate implementation. That is why the purpose of this article is to explain its general characteristics and to explore some basic rules that may help to clarify the cases in which the institution applies. The idea is to provide some theoretical and practical tools to understand the content and the scope of competition advocacy, due to its importance in Colombian antitrust Law