The Colombian criminal system was modified from 2002 to 2004 under the assumption of changing a model of inquisitorial tendency to an accusatory one. This reform was built under the idea of concordance between the political and criminal principles of the accusatory system with a social and democratic rule of law, as well with the need of a more efficient criminal process. This text will describe how the criminal procedure works in Colombia and also the issues of an accusatory system, which will help to understand the Colombian experience and learn from it in other countries.