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The OPERAS core group met in the Central Library in Amsterdam on 24 January 2018. The core group has validated the future unified services that OPERAS will offer: a Certification Service (DOAB), a Discovery Service (Isidore), and a Research for Society Service (Hypotheses).Certification ServiceThe Directory of Open Access Books (DOAB) is a discovery service for open access books where metadata, provided by academic publishers, is harvestable. DOAB is open to all publishers who publish academic and peer reviewed books in open access. It was officially launched in 2013 and is a service of OAPEN. OPERAS will build on DOAB for its certification service.Discovery ServiceIsidore is a search platform that allows for accessing digital data in the SSH. Its main features are controlled vocabularies, which produced enriched metadata. It has been developed by Huma-Num. OPERAS will use and further develop Isidore for its discovery service.Research for Society ServiceOPERAS will provide a hub allowing for collaborative research for all researchers and socio-economic actors, e.g. journalists, artists, SMEs, organizations and associations. The Research for Society Service will be based on Hypotheses.[caption id="attachment_1138" align="alignleft" width="300"] The OPERAS core group validates the Certification Service (January 2018).[/caption][caption id="attachment_1137" align="alignleft" width="300"] The OPERAS core group validates the Discovery Service (January 2018).[/caption]&#160;&#160;&#160;&#160;&#160;&#160;The OPERAS core group comprises 9 organizations: Max Weber Stiftung (MWS) - DE National Documentation Centre (EKT) - GR OAPEN - NL OpenEdition - FR The Institute of Literary Research of the Polish Academy of Sciences (IBL PAN) - PL UCL Press - UK University of Coimbra - PT University of Turin (UniTo) - IT University of Zadar - HR