21 CFR § 820.100 - Corrective and preventive action.
(1) Analyzing processes, work operations, concessions, quality audit reports, quality records, service records, complaints, returned product, and other sources of quality data to identify existing and potential causes of nonconforming product, or other quality problems. Appropriate statistical methodology shall be employed where necessary to detect recurring quality problems;
(4) Verifying or validating the corrective and preventive action to ensure that such action is effective and does not adversely affect the finished device;
(5) Implementing and recording changes in methods and procedures needed to correct and prevent identified quality problems;
(6) Ensuring that information related to quality problems or nonconforming product is disseminated to those directly responsible for assuring the quality of such product or the prevention of such problems; and
(7) Submitting relevant information on identified quality problems, as well as corrective and preventive actions, for management review.
(b) All activities required under this section, and their results, shall be documented.