# Overview of source verification

Source verification allows you to verify the data entered on forms against source documents, and to mark the data items you have verified to indicate that they are complete. The forms can be marked as verified or not verified from the Source Verification Listing page or from the Data Viewer.

During study design, any item that should be source verified is marked as SV Required by the study designer. You can decide whether all the data marked as SV Required during study design must be source verified, or if the amount of data to be source verified can be reduced using partial source verification (Partial SV). For more information, see Partial source verification (Partial SV).

You can perform source verification:

- Online, from the Source Verification Listing page or from the Data Viewer.

  For more information, see Online source verification or Marking records Verified or Not Verified in the Data Viewer.

- Offline, from a printed listing.

  For more information, see Offline source verification.

Note: Form or data changes invalidate source verification. For more information, see How a form change affects source verification.

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