# Partial SV and items marked as SV Required during study design

During the study design, any item that must be source verified is marked as SV Required by the study designer. If you are using Partial SV, items marked as SV Required must be source verified in the InForm application only if the following selections are made:

- Partial SV Subject Selection—SV Required items are on a form associated with a subject that is selected for Partial SV (that is, the subject is in the SV Pool).

  For more information, see Subjects and the SV Pool.

- Partial SV Form Selection—SV Required items are on a form that is identified as a critical form.
  - Every SV Required item on the form is considered critical.
  - Items on the form that are not SV Required are not considered critical.

  For more information, see Critical forms.

- Partial SV Item Selection—SV Required items or itemsets on a form are designated as critical.

  In the InForm application, you can override the criticality defined for an item or itemset in the Central Designer application. Items that are only SV Required, but are not critical (either through the Item SV Critical property or the SV Critical override) are not considered to be critical.

  For more information, see Critical items.

Note: In cases where there are multiple Partial SV settings in effect, the critical subjects and critical forms selections take priority over the critical item selections. For more information, see When item-level source verification takes effect.

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