Capability Levels Versus Maturity Levels
The continuous representation consists of capability levels, while the staged representation consists of maturity levels. The main difference between these two types of levels is the representation they belong to and how they are applied:
* Capability levels, which belong to a continuous representation, apply to an organization’s process-improvement achievement in individual process areas. There are six capability levels, numbered 0 through 5.
* Maturity levels, which belong to a staged representation, apply to an organization’s overall process-improvement achievement using the model. There are five maturity levels, numbered 1 through 5. Each maturity level comprises a set of goals that, when satisfied, improve processes. Maturity levels are measured by the achievement of the goals that apply to a set of process areas.
Reference:- http://www.sei.cmu.edu/library/abstracts/news-at-sei/spotlightdec99.cfm