# Data model security

Display override settings and site associations determine the clinical data that is available from the clinical model for use in reports. For example:

- If an item is not visible to you in the InForm application, when you create a report that contains the item, the cells in the column that corresponds to the item contain the text N/A.
- You can see and create reports using only information for the sites in the study to which you have access.

The clinical model also contains relationships to the operational report topics. These relationships allow you to create reports in the InForm Ad Hoc Reporting workspace by dragging and dropping clinical and operational report elements onto the report palette. This operation is conceptually similar to creating a SQL join directly between a clinical view and an operational view.

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