Quality Control (QC) is defined as the processes and methods used to compare product quality to requirements and applicable standards, and the action taken when a nonconformance is detected.
Quality Assurance
Quality Assurance (QA) is the set of activities (including facilitation, training, measurement and analysis) needed to provide adequate confidence that processes are established and continuously improved in order to produce products or services that conform to requirements and are fit for use.
Differentiating Between Quality Control and Quality Assurance
QC is an activity that verifies whether or not the product produced meets standards. QA is an activity that establishes and evaluates the processes that produce the products. If there is no process, there is no role for QA. Assurance would determine the need for, and acquire or help install system development methodologies, estimation processes, system maintenance processes, and so forth.
Once installed, QA would measure them to find weaknesses in the process and then correct those weaknesses to continually improve the processes.
It is possible to have quality control without quality assurance. For example, there might be a standard that “ALTER GO TO” statements in COBOL should not be used. Regardless of whether a program is produced using a system development process or done by an individual without a process, it could still be checked to determine whether or not “ALTER GO TOs” are in the program.
The following statements help differentiate QC from QA:
• QC relates to a specific product or service.
• QC verifies whether particular attributes exist, or do not exist, in a specific product or service.
• QC identifies defects for the primary purpose of correcting defects.
• QC is the responsibility of the worker.
• QA helps establish processes.
• QA sets up measurement programs to evaluate processes.
• QA identifies weaknesses in processes and improves them.
• QA is a management responsibility, frequently performed by a staff function.
• QA evaluates whether or not quality control is working for the primary purpose of determining whether or not there is a weakness in the process.
• QA is concerned with all of the products that will ever be produced by a process.
• QA is sometimes called quality control over quality control because it evaluates whether quality control is working.
• QA personnel should not ever perform quality control unless doing it to validate quality control is working.作者: lguse 时间: 2007-4-12 08:20
不错，对质量控制和质量保证有了了解。作者: wgs0923 时间: 2007-4-12 14:30 标题: 由于水平有限,马马虎虎翻译一下,有些地方表达得不是很确切. 质量控制
质量控制（QC）被定义为将产品质量和需求、可适用的标准作比较的过程和方法，以及在发现不一致性时执行活动。