Open Repositories is an annual conference for everyone interested and involved in the world of repositories - mainly institutional or subject repositories providing open access to research-related publications. This year's conference (OR11) was held in Austin, Texas, and hosted by the University of Texas.

Imma Subirats and I agreed to present a joint paper to the OR11 conference which we called "Changing Platforms: Parallel case studies in repository platform migration".

This presentation was based on our personal experience of migrating long-established, fully operational repositories between two of the leading open source, open access repository platforms (DSpace and EPrints). In 2010, the E-LIS repository migrated from EPrints to DSpace, while the University of London SAS repository migrated from DSpace to EPrints. In both cases the migrations achieved successful outcomes. The presentation documents key decisions and actions of these migration projects, in order to help and support decision-making by repository managers and technical advisers in the process of software migration, or perhaps just considering it.