21 C.F.R. § 820.100 : Food and Drugs — FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES — MEDICAL DEVICES — QUALITY SYSTEM REGULATION — CORRECTIVE AND PREVENTIVE ACTION — Corrective and preventive action

(a) Each manufacturer shall establish and maintain procedures for implementing corrective and preventive action. The procedures shall include requirements for:
(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;
(2) Investigating the cause of nonconformities relating to product, processes, and the quality system;
(3) Identifying the action(s) needed to correct and prevent recurrence of nonconforming product and other 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.

21 C.F.R. § 820.100