Abstract
The administrative agreements have become the mechanism used by Colombian territorial administrations to evade the public bidding process, given that the rules that governs this type of contracting with non-profit entities, the suitability of the contractor does not have a courier or Watch, so it becomes a discretionary choice. In this document, the writer developed the legal nature and applicable regime of these entities. He then confronts the rigidity of state contracting with the flexibility that the nature of the above-mentioned institutions based on the figure of administrative collaboration. On the other hand, it addresses a practical and real case with the interest to show the hypothesis which was structured by the investigation. Finally, it issues relevant conclusions regarding all the topics touched on in the text.