This document discusses ORCID and its implementation at the University of Hong Kong. ORCID provides researchers with a unique identifier that connects their work and activities throughout their career. It helps address problems like name ambiguity and makes work more discoverable. The document outlines how ORCID works and benefits researchers by reducing repetitive data entry and improving attribution. It also provides examples of how ORCID integrates with universities, publishers, funding agencies and other research systems.