The PRIMARY purpose of a maturity model is to compare the:

A maturity model is a tool that assesses the level of development and performance of key processes within an organization. A maturity model typically defines a set of criteria, standards, and best practices for each process, and assigns a rating or score based on the degree of compliance or achievement. A maturity model can help compare the current state of key processes to their desired state, by identifying the strengths, weaknesses, gaps, and opportunities for improvement. A maturity model can also help establish a roadmap for process improvement, by setting realistic and measurable goals and objectives, and monitoring the progress and results. References = Risk and Information Systems Control Study Manual, Chapter 1: IT Risk Identification, Section 1.4: IT Risk Scenarios, p. 49-50.