Johannes Keizer presented on data interoperability and shared vocabularies for agriculture. He discussed the Global Agricultural Concept Scheme (GACS) which maps terms from various agricultural thesauri to facilitate linking of data. However, mapping terms is an imperfect solution and ontologies are needed. GACS shows promise as a starting point but requires community involvement and standards to fully develop shared semantics and linked open data. Realizing this vision will involve overcoming challenges around integration of diverse knowledge organization systems and languages.