In the context of the Horizon 2020 project OpenAIRE Advance, the institute DANS (Data archiving and Networked Services) in the Netherlands implemented the OpenAIRE CRIS/CERIF Guidelines using a CRIS on a national level: NARCIS Portal. This blog describes the "lessons learned" during the technical implementation of the OpenAIRE (OA) CERIF-XML profile for CRIS managers into the NARCIS domain. This implementation has been part of Subtask 6.1.2. Interoperability - Connecting with CRIS-CERIF. In gene...