# Item types

Forms can contain items or itemsets.

- Item—A non-repeating data point on a CRF.
- Itemset—A group of items that repeat on a CRF.

  You use itemsets for submitting multiple rows of data on a form at one time. There are two types of itemsets: Add Entry itemsets and Repeating Data itemsets.

  These itemsets have attributes that are configured during study design. The display and behavior of the itemsets differ in the InForm application depending on the type. Both itemset types can appear on the same form.

  For more information, see Feature comparison: Add Entry itemsets and Repeating Data itemsets.

An item is composed of multiple controls. Controls on a form are visible or hidden depending on whether their parent controls are selected. For more information, see Dynamic child controls.

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