You can use the Users (by attribute) data type to create reports that indicate how artifacts are assigned or otherwise associated with users.
To define Users (by attribute) reporting criteria:
To include multiple user attributes for a single user, you must add the user again with the additional attribute selected. For instance, if you wanted to generate a report to indicate which users have ownership and quality assurance responsibility for the artifacts in your project, you would need to select each user twice--first with the Assigned to user attribute, then with the QA contact user attribute.