Abstract
This article makes a political-criminal analysis of criminal law as ultima ratio, with a criminal procedural approach in relation to the abbreviated criminal procedural; this is achieved thanks to a general study on the theory of ´Legally protected interest´ that is grounded in the specific problematic of the formation of laws. In addition, it examines the antecedents of the incorporation of the abbreviated procedure and the private accuser to the Colombian Constitution and Law, for which purpose - and from a utilitarian perspective - it makes a comparative analysis of the national regulations with the Spanish and Chilean legislations.