* Input and Output Parameters are used to transmit values between the Process Diagram and the Business Object Action.
* Business Objects do not store any values. Any value needed to input into the Elements of an application should instead be passed down from a Process via an Input Parameter. The Business Object should only retain the information passed down to it for as long as it takes to complete the interaction.
* The Page Reference Stage on the upper page must be set up to receive the value from the end stage of the lower Page. An end-stage on a lower page can use output parameters to transmit a value up to a page reference stage on an upper page.
