This Topic Report describes current progress in the establishment of PSI ‘Asset Registries’ in the context of the provisions of the PSI Directive, taking into account recent developments in the area of open data catalogues which are relevant to PSI re-use. It goes on to discuss the need to satisfy demand for easier discovery of PSI across Europe for re-users wishing to create cross-border services and products, describing the possible advantages and disadvantages of different models for approaching this issue. It will be followed by a second Topic Report covering current best practice in the implementation of PSI portals in greater depth.