The aim of this deliverable is to summarize and analyze the challenges of international access provision based on the work done in the ATMO-ACCESS project and particularly based on a test case from the Italian infrastructure project “ITINERIS” (Integrated Environmental Research Infrastructures System) [1]. A major part of the ITINERIS activities aim at promoting and supporting access to services provided by the Italian RIs to European Users and for Italian users to services provided by ACTRIS facilities. Based on the work done in ATMO-ACCESS and the test case, we provide recommendations to further develop the international access framework and modalities for atmospheric RIs.