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1. Conclusion on the issue of stamping external documents: Whether external documents need to be stamped depends on the circumstances. Situation 1: If the external document is a controlled document, then it needs to be stamped with a control stamp, such as the testing standards used in laboratories； Case 2: If the external document is not under control, there is no need to affix a control stamp, such as a red-headed document issued by the Communist Youth League. To properly understand the \"Controlled\" and \"Uncontrolled\" sections of documents, the vast majority of laboratories use red stamps marked \"Controlled\" or \"Uncontrolled\" to be applied to documents as one of the methods for controlling them. In the process of quality management system certification and operation, it is necessary to determine which documents should be stamped as \"Controlled\" and which should be marked as \"Uncontrolled\". Wrong judgments often occur in the laboratory. To accurately determine whether a document is “controlled” or “uncontrolled” and thus stamp it correctly, it is necessary to understand it from three aspects. The “controlled state” and “uncontrolled state” of a document: The controlled state refers to the entire life cycle of a document, during which every stage is under strict oversight by the organization; whenever the master document is modified, all subordinate documents are also modified. A file in this state of “complete control” is in a controlled state. Conversely, a document that, at some or several stages of its existence—such as when it is issued, used, modified, or repealed—the organization is unable or unable to exercise control over it, is in a state of \"partial control,\" which constitutes a state of uncontrolled document. 2 The meaning of “controlled” or “uncontrolled”: Regarding “controlled” or “uncontrolled,” a considerable number of laboratories currently interpret “controlled” as “under control” and “uncontrolled” as “not under control,” based on the literal meaning of the terms. It can be said that this understanding is correct; the problem lies in considering documents stamped with a \"controlled\" seal as \"controlled documents\", and those stamped with a \"non-controlled\" seal as \"uncontrolled documents\". Obviously, this understanding is wrong. In fact, “controlled” and “uncontrolled” are qualitative descriptions of the file’s existence status, and they are not requirements for file management. 3 The role of the “controlled” and “uncontrolled” stamps. A common misconception is that the use of a “controlled” stamp indicates that the document is important and therefore needs to be controlled ； The marking “Uncontrolled” indicates that this document is of minor importance and therefore does not require control. It must be admitted that, as information and its medium of transmission, documents vary in terms of the number of recipients they serve and the value of the information they contain; however, we must be clear that whether a \"controlled\" stamp or a \"non-controlled\" stamp is applied is irrelevant to this. The only true purpose of a control chapter is to identify documents. The purpose is to distinguish between expired, invalid, or revoked documents in order to prevent their unintended use. 4. Points to note: Applying a controlled stamp is one way of indicating that a document is controlled. Controlled documents can also be made controlled without using such a stamp; for example, the word “Controlled” can be written by hand, and as long as it is clearly stated in the relevant procedures, this is entirely acceptable.