The fifth and final workshop in the Share-PSI series will address the topic of maximising interoperability: core vocabularies, location-aware data and more. The workshop is explicitly interested in ideas, concepts and solutions that directly or indirectly address the interoperability of open data and PSI. As with all Share-PSI workshops, the aim is to identify best practices in these areas with a focus on Public Sector Information, although cultural heritage, commercial and scientific data are also relevant.