The Choice Is Yours! Researchers Assign Subject Metadata to Their Own Materials in Institutional Repositories :
“The Digital Commons platform for institutional repositories provides a three-tiered taxonomy of academic disciplines for each item submitted to the repository. Since faculty and departmental administrators across campuses are encouraged to submit materials to the institutional repository themselves, they must also assign disciplines or subject categories for their own work. The expandable drop-down menu of about 1,000 categories is easy to use, and facilitates the growth of the institutional repository and access to the materials through the Internet.”
URL : http://scholarworks.wmich.edu/library_pubs/31/