根据已建立的质量特性标准，通过定期或不定期的测试来评估质量绩效。对于定期测试，设计一个有足够时间的时间表，以对过程或系统进行任何必要的调整，以保持所需的质量水平。对于阶段性测试，只要发生已知的不合格或故障，就会进行测试，这会导致已知的输出或结果不能满足性能要求。 Evaluating quality performance through periodic or episodic testing against the established standards for quality characteristics. For periodic testing, design a schedule with sufficient time to make any required adjustments to the process or system to maintain the desired level of quality. For episodic testing, conduct a test whenever a known non-conformance or fault occurs, which results in outputs or outcomes known to be unsatisfactory to performance requirements.