Persistent, unambiguous Identifiers are critical to research. The Australian National Data Service describes the roles they play.
Research Activity Identifier - RAiD is a unique and persistent identifier for research projects. It acts as a container for research project activities by collecting identifiers for the people, publications, instruments and institutions that are involved.
ORCID records may be linked to other identifier systems (i.e. into Scopus or Web of Science). If ORCID records are kept up to date, there is no need to maintain records in multiple systems.