System Variables determine the fields or data values on a document that can be included in messages or displayed on the Summary Tab. They are predefined and module specific.
For instance, here’s a standard details section of a job posting, showing a description, number of positions, and the service type. What happens when you use the admin menu to add additional details?
![Image depicting a screencap of JP Details on summary tab showing information for Description, Business Unit, and Site, followed by the System Variable edit page with the Coordinator, Number of Positions, Service Type, Job Code, and Start Data options checked; followed by a revised screencap of the JP Details on summary tab showing the new information](/service/media/topic/fd2e6e85-d4ae-41a0-82c0-7343530d818e/FG200_2311_en-US_media/FG200_2311_en-US_images/SystemVariablesEdit.png)
When new options are selected on the System Variables Edit page, those options appear on the summary tab of the job posting.