Today, delivering quality software, on time and respecting costs is a key differentiator for companies dedicated to this activity. The constant search for productivity and quality in software project management led to several models that seek to help this area with methods and forms of work organization. The best known model in the area of software management is the Waterfall Model, characterized by stiffness and well-defined phases in the process. Once found problems with rigid models have emerged as alternative management of agile methods, characterized by agility, and adaptability to various iterative projects. Given that this paper analyzes the problem of managing software development projects, and proposes a reference model for managing software projects considering the traditional approach of project management as well as the agile approach. The research examines the compatibility of agile methodologies with the Capability Maturity Model Integration (CMMI) is a maturity model in software development processes. Finally the research presents a case study, which allowed us to observe the strengths and weaknesses of the methods studied, concluding that such practices contribute to improved and agile project management software.