EIs can be business data, control data and rules based data.

Data Entry Preferences Business Data: Customer Name, Address, Phone, and so on and so forth.

Control Data: The data elements are those that invoke the transaction or change the behavior of the application. Each check box represents a data element. Additionally, the sort employee list radio buttons represents one data element as well as the time format radio buttons.

Control information changes or alters the state (or behavior) of the application. Control information specifies how, what, and when data will be processed.