In recent years, a number of certification standards and accreditation procedures have been developed worldwide: Data Seal of Approval (DSA), Network of Expertise in long-term Storage and Accessibility of Digital Resources in Germany (NESTOR) seal / German Institute for Standardization (DIN) standard 316442, Trustworthy Repositories Audit and Certification (TRAC) criteria / International Organization for Standardization (ISO) standard 163633, and the International Council for Science World Data System (ICSU-WDS) certification of WDS Members. The DSA and WDS certifications both offer a basic certification standard for trusted digital repositories. Their catalogues of requirements and their review procedures are based on the same principles of openness and transparency, and of striking the right balance between simplicity and robustness of the work and effort involved. Up to this point, the two standards have evolved and operated independently. The primary focus of DSA has been on digital repositories in the Humanities and Social Sciences. For historical reasons, the focus of ICSU-WDS has been on Earth and Space Sciences. Both initiatives, however, have fully multidisciplinary missions. Under the umbrella of the RDA/WDS Interest Group (IG) on Certification of Digital Repositories, this Working Group (WG)—consisting of representatives from the DSA and WDS communities and beyond—aims to explore and develop a DSA–WDS partnership with the objectives of realizing efficiencies, simplifying assessment options, stimulating more certifications, and increasing impact on the community. The output from this WG is envisioned as a possible first step towards developing a common framework for certification and a service of trusted data repositories.