# Form association

Form association is the ability to establish a relationship between two repeating forms. Associating the information on forms can make it easier to recognize possible relationships between collected data, study drugs, adverse reactions, and concomitant medication.

A form can have zero-to-many associations. Study designers define the ability to link two forms. If your study is set up with this feature, the lower half of the page lists the possible instances of forms that can be associated when you create a new instance of a form.

For example, an instance of an adverse event can be linked to a concomitant medication, and that particular concomitant medication can be linked to one or more adverse events.

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