Abstract. The Global Earth Observation System of Systems (GEOSS) is implemented by the Group onEarth Observations (GEO) with the goal to ensure that decision in nine Societal Benefit Areas (SBAs) of Earth observations (EOs) can be informed by sustained Earth observations. Extracting actionable information from Earth observations often depends on research, and utilization of the societal benefits of EOs requires the involvement of science and research communities. Building a GEOSS responding to the needs of a wide range of users necessitates contributions from many science and technology (S&T) communities. The success of GEOSS depends on a outreach of GEO to the relevant S&T communities, and the outreach concept has a focus on demonstrated services for S&T communities. The GEO Work Plan includes several Tasks focusing on outreach to S&T communities, and most of the GEO Community of Practice have a strong S&T component. Infrastructure serving and linking S&T users communities and GEOSS has been developed and is integrated into a GEOSS S&T Service Suite. The GEOSS S&T Stakeholder Network facilitates input from S&T communities to GEO.

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