This chapter of the book attempted to establish the incidence and effectiveness of the right of petition in the judicial decongestion in the municipality of Sincelejo during the years 2016 and 2017, having its base in the analysis from the practice of CECAR' s Legal Clinic. With this chapter, we searched through the historical, normative and jurisprudential study in Colombia of the right of petition, as well as the analysis of public law statistics of the documents elaborated in the practice of CECAR' s legal practice, to establish the effectiveness of the right of petition in the decongestion of Sincelejo' s judicial offices, as well as its incidence in the access to justice, being able to analyze that the right of petition is the most used means to go directly to the claim of the rights of the user or to the solution of the problem raised with 68%, compared to its second competitor that was the action of protection with 21%