The structure of the IR is hierarchical. Collections are organized by college/school, research center, and university organization. Individual departments are listed within these collections. There is also a special section within the IR devoted to student scholarship to support the efforts of Advance: Student Research Experience. As the IR is still relatively new, many of the collections are acting as placeholders until they get populated.
In most cases, depositors/contributors will submit materials to the departments in which they belong or that sponsored their work. Work may be submitted to (or shared with) more than one department, organization, or research center.