Expressions can be implemented in a number of ways. Two of the most common methods are to create an expression-type question, or add an expression-type attribute to an existing question or response. The Type you assign to each expression will determine how it is triggered.
Refer to the following table to see a list of expression types:
| Expression Type | Description | Further Reading |
|---|---|---|
| Form Expression | This type of expression runs any time there is a postback, for example when its question group first loads. | Implementing an Expression |
| Form Load Expression | This type of expression will only run when its question group loads. | Implementing an Expression |