Capability Maturity Model (CMM) -a systems development process maturity framework to help developers improve their development process.
Many CMM article links

THE FIVE MATURITY LEVELS OF THE SEI CAPABILITY MATURITY MODEL

• Level 1 - Initial : generally characterized by an organization which does not have a stable environment for developing and maintaining systems.
• Level 2 - Repeatable : generally characterized by policies and procedures being in place and adhered to for systems development.
• Level 3 - Defined : characterized by an organizational standard and consistent systems development process due to its stability and repeatability on successive projects.
1. Standards
2. Establishing readiness criteria
3. Developing inputs
4. Procedures for performing work
5. Work verification procedures such as peer reviews
6. Developing outputs
7. Determining completion criteria
• Level 4 - Managed : characterized by an organization that sets quantitative quality goals for both its systems development products and its system development processes.
• Level 5 - Optimizing : characterized by the entire systems development organization being focused on continuous process improvement.

Overview of the People Capability Maturity Model (P-CMM)
The Capability Maturity Model for Software

ISO 9000 (International Standards Organization) refers to a series of five related quality management standards.
A Comparison of ISO 9001 and the Capability Maturity Model for Software
How ISO 9001 Compares With the CMM

Personal Software Process (PSP)
The Personal Software Process Overview, Practice, and Results
What are the benefits of the PSP Software Process?
The Personal Software Process
IPD PSP Support Page