Mark E. Phillips, Pamela Andrews, and Ana Krahmer have published "Understanding Connections: Examining Digital Library and Institutional Repository Use Overlap" in Publications.
Here's an excerpt:
The University of North Texas Libraries; Digital Collections are situated as a unified whole within their preservation infrastructure, with three separate user interfaces serving the content to different audiences. These separate interfaces are: The UNT Digital Library (DL), The Portal to Texas History, and The Gateway to Oklahoma History. Situated within each interface are collections, and hosted within these collections are digital objects. One collection, the UNT Scholarly Works Repository, specifically serves UNT's research and creative contributions and functions as the Institutional repository (IR) for the University of North Texas. Because UNT Scholarly works is seated as a collection amongst other collections, users can access faculty research, not just out of an interest in research from specific faculty members, but also as it ties into the user's broader understanding of a given topic. With flexible infrastructure and metadata schema that connect collections beneath the umbrella of the wider preservation infrastructure, the UNT DL employs full-text searching and interlinked metadata to strengthen and make visible the connections between objects in different collections. This paper examined how users navigated between other collections within the UNT IR, as well as within the UNT DL. Through this examination, we observed patterns between how users navigated between objects, understood which collections may have related to one another, examined why some unique items were used more than others, and viewed the average number of items used within a session.