ORCID and ISNI are separate, independent organizations that assign identifiers to individuals and are using the same identifier format. While ISNI and ORCID have different missions and employ different processes for assigning identifiers and linking people with their works and their affiliated institutions, points of overlap between them justify investigating options for interoperability. ORCID and ISNI are agreed on the need to aim for interoperation through linking and of sharing public data between the two systems. In addition, ORCID and ISNI are committed to investigate the feasibility of a shared identifier scheme for a single number to represent an individual in both the ORCID and ISNI databases.
Read the full statement here: http://orcid.org/blog/2013/04/22/orcid-and-isni-issue-joint-statement-interoperation-april-2013