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* Where appropriate, the reason for alteration must be noted<ref name=EUGMP4 />{{Rp|___location=¶4.9}}<ref name=FDAGCP /><ref name=WHO4 /><ref name=FDAJ />
* Controls exist to prevent the inadvertent use of superseded documents<ref name=WHO4 /><ref name=MHLW169 />
* Electronic versions can only be modified by authorized personnel
* A history ([[audit trail]]) must be maintained of changes and deletions to electronic versions<ref name=EUGMP4 /><ref name=FDAGCP /><ref name=ICH7>[http://www.ich.org/cache/compo/363-272-1.html#Q7A ICH. "Q7: Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients" (Section 6)]</ref><ref name=EC94 />
* Supporting documents can be added to the original document as an attachment for clarification or recording data. Attachments should be referenced at least once within the original document. Ideally, each page of the attachment is clearly identified (i.e. labeled as "Attachment X", "Page X of X", signed and dated by person who attached it, etc.)
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