先来看在CMMI模型中的相关描述：
1 质量保证的定义：
A planned and systematic means for assuring management that the defined standards, practices, procedures, and methods of the process are applied.[参见模型562页]
2 质量控制的定义：
The operational techniques and activities that are used to fulfill requirements for quality. (See also “quality assurance.”)[ 参见模型562页]
3 对PPQA的概述：
The Process and Product Quality Assurance process area supports all process areas by providing specific practices for objectively evaluating performed processes, work products, and services against the applicable process descriptions, standards, and procedures, and ensuring that any issues arising from these reviews are addressed. Process and Product Quality Assurance supports the delivery of high-quality products and services by providing the project staff and all levels of managers with appropriate visibility into, and feedback on, the processes and associated work products throughout the life of the project. [参见模型68页]
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