This booklet introduces the Minimum Viable Skillset (MVS) for Data Stewards, essential for implementing Open Science principles and supporting the European Open Science Cloud. The MVS outlines two role variations: "Coordinator" and "Embedded." The "Coordinator" role supports an organisation’s research domains, while the "Embedded" role operates closely with specific research teams and their domain practices. These roles may overlap depending on resources, disciplinary needs, and organizational culture.