Proportionality was at first acknowledged in Law as the guideline to restrict the enacting and disciplinarian power of the State particularly exclusive to Criminal and Administrative Law. Because of the influences from the European Constitutional Law, however, it is currently known as a control mechanism to rights and guarantees limitation and as a solution to the collision between constitutional rights and principles. The jurisprudential evolution of proportionality to the concept of test or trial, the uses, components, intensity levels and particular notions of “Colombian trial” are studied in this article. Along with proportionality, this document looks at the evolution in the constitutional jurisprudence of the concept of “hard core” of rights, since it is no possible to conceive a fundamental rights theory that does not include in itself the limits to all sorts of intervention on the enjoyment of rights within a democratic regime.