About rules

The two classes of rules are:

Data-entry rule—A rule that checks whether data is valid or that sets the value of an item based on a calculation. You can create a data-entry rule for study designs, study elements, study events, forms, and items.
Workflow rules and global conditions
- Workflow rule—A logical construct that tests data values to determine the study element, study event, or form to which a subject progresses next.
  You can create a workflow rule for a study element, study event, or form only.
- Global condition—A logical construct that, when applied to a study object, determines whether the study object will appear for a particular subject.