8.2 Retrospective Validation ProceduresIn the case of retrospective validation, processes and purchase speci¬fications as well as manuals from the equipment manufacturer may not be available. Therefore, the IQ is, for many parts, equivalent to the actual survey of the plant. Incomplete documentation may be replaced by the IQ documentation. The IQ refers as often as possible to engineering documents (e.g., P&I diagrams, plant functional specifications, process flow diagrams, inventory lists, etc.) to avoid redundant documentation and to minimize the expenditure of updating.
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