SEI Capability Maturity Model

Level 1 - Uncertainty. Success depends on individual effort.
Level 2 - Awakening. Basic project management practices are established.
Level 3 - Enlightenment. Standard process throughout organization.
Level 4 - Wisdom. Detailed metrics are collected and evaluated.
Level 5 - Certainty. Continuous process improvement via metrics feedback.

"Possibly by coincidence, both the Crosby and Humphrey maturity models resemble a maturity model developed circa 500 BC by Buddhist scholars as a kind of map for showing the stages on the path to religious enlightenment." (Capers Jones, 1997)

References

Crosby, Philip B. Quality is Free. Mentor Books, New York, NY; 1979
Gottesdiener, Ellen. What is your Development Maturity. Application Development Trends, Mar 1996, p 60-74.