The article presents the results of a survey of Russian oceanographers regarding the need for data on the physical, biogeochemical and biological state of the Black and Azov Seas in order to form requirements for the creation of an online platform System of Systems (SoS) based on modern tools, observations, modeling and data integration, performed according to the stakeholder survey methodology and an electronic questionnaire developed within the framework of the international project “DOORS” and Agreement N 075-15-2021-941 (13.2251.21.0008) with the Ministry of Science and Higher Education of the Russian Federation “Comprehensive studies of the ecological state of the waters of the coastal zone of the northeastern shelf of the Black Sea in the framework of participation in the international project DOORS”. One of the main goals of the DOORS project is to create and test a user-driven online System of Systems (SoS) platform that will collect, integrate, provide its data and observations, and offer specialized services and products to the Black Sea basin stakeholder communities.