# Critical items

Critical items or itemsets are those designated as both SV Required and critical.

Items or itemsets can be designated as critical in three ways.

- In the Central Designer application—The study designer specifies a property of an item or itemset to be SV Required and SV Critical.

  For more information, see the Central Designer InForm Design Guide.

- With MedML in the InForm application—A system administrator can use MedML to manually override the SV Critical property for an item or itemset that was defined in the Central Designer application. MedML can be used to apply overrides for one site or across all sites.

  For more information, see the Utilities Guide.

- With the Set SV Settings dialog box in the InForm user interface—If you have the proper rights, you can use the Set SV Settings dialog box to manually override the SV Critical property for an item or itemset that was defined in the Central Designer application. The user interface can be used to apply overrides for one site.

  You can choose one of the following override options.

  - Study Default—Use the criticality set for the item during the study design in the Central Designer application.
  - This Form—Set the item to critical for only the selected form.
  - All Forms—Set the item to critical for all forms. All instances of the item must be verified, not just the items on the form on which you set the override.
  - Not Critical—Set the item to not critical for only the selected form.

If an itemset is designated as critical, all items within the itemset are critical. However, because the InForm application verifies itemsets at the row level, and not by individual items, setting an item within an itemset as critical has no effect.

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