Presentation given on the University of London VuFind discovery layer implementation at the Kuali Days UK conference, 29 October 2013. The session focused on discovery layer choices – software-as-a-service, open source or community source – of three libraries that are actively planning integration with Kuali OLE, including perspectives from the University of Chicago, Indiana University and the University of London and featured specific use cases for OLE discovery layer implementations at their institutions and what influenced their choices.