High Quality Content by WIKIPEDIA articles! Capability Maturity Model Integration (CMMI) is a process improvement approach. CMMI can be used to guide process improvement across a project, a division, or an entire organization. Processes are rated according to their maturity levels, which are defined as: Initial, Repeatable, Defined, Quantitatively Managed, Optimizing. Currently supported is CMMI Version 1.3. CMMI is registered in the U.S. Patent and Trademark Office by Carnegie Mellon University.