The chapter provides an overview of the Capability Maturity Model for Software (CMM V1.1), a framework developed by the Software Engineering Institute (SEI) to help organizations improve their software processes. The CMM V1.1 describes five maturity levels, each with specific process areas and common features, to guide organizations in achieving better software process capability. The levels range from "Initial" (ad hoc and chaotic) to "Optimizing" (continuously improving). Each level emphasizes different aspects of software process management, such as repeatability, definition, management, and optimization. The chapter also discusses the importance of process capability and performance, and introduces the IDEAL model for systematic software process improvement. Finally, it outlines the ongoing evolution of the CMM, including planned changes for Version 2, such as the addition of risk management and supplier management, and the integration of other capability maturity models.The chapter provides an overview of the Capability Maturity Model for Software (CMM V1.1), a framework developed by the Software Engineering Institute (SEI) to help organizations improve their software processes. The CMM V1.1 describes five maturity levels, each with specific process areas and common features, to guide organizations in achieving better software process capability. The levels range from "Initial" (ad hoc and chaotic) to "Optimizing" (continuously improving). Each level emphasizes different aspects of software process management, such as repeatability, definition, management, and optimization. The chapter also discusses the importance of process capability and performance, and introduces the IDEAL model for systematic software process improvement. Finally, it outlines the ongoing evolution of the CMM, including planned changes for Version 2, such as the addition of risk management and supplier management, and the integration of other capability maturity models.