The CMMI Framework provides the structure needed to produce CMMI models, training materials, and appraisal-related materials. The CMMI Framework is a structure that allows the use of multiple models that serve different constituencies while maintaining a strong CMMI identity. Within the CMMI Framework, model components are classified as either common to all CMMI models or applicable to a specific area of interest or constellation. The common material that is present in all CMMI models is called the "CMMI Model Foundation," or "CMF."
CMF components are combined with material applicable to a constellation (e.g., Services, Development) to produce a model. Some of this material is shared across constellations, and other material is unique to only one.
A "constellation" is defined as a collection of components that are used to construct models, training materials, and appraisal-related materials in an area of interest. CMMI-SVC belongs to the Services constellation.