ORCID Open Letter - One Year On Report MeadowsAlice HaakLaurel 2017 In January 2016, eight publishers and scholarly associations signed an open letter committing their organization to requiring ORCID iDs for authors and to do so following ORCID's best practices. By the end of 2016, there were 25 signatories to the letter, 16 of which had gone live with this requirement. This report summarizes the impact of this initiative, highlights successes and challenges, and identifies opportunities for improvement based on lessons learned.