The Phenotype Harmonization WG will be responsible for defining data format and documentation requirements for Study Site and Affiliate Member-provided phenotype data. These definitions will be chosen to enable generating a Consortium-wide phenotype variable inventory and subsequent harmonization. The WG will also define data standards for Consortium-generated data (e.g., ontologies to be used for Consortium-harmonized variables). The Phenotype Harmonization WG will inventory existing data, coordinate and prioritize harmonization efforts, establish and document harmonization best practices, and define consortium phenotype data standards. As phenotype-specific WGs are established, this WG may also be called upon to refine or update PRIMED standards in collaboration with the phenotype-specific WGs.