Once a year, COAR Controlled Vocabularies Editorial Board checks the validity of the URIs of matched concepts from third party vocabularies. If the URI of an external concept is not working any more, such matching is removed from the COAR vocabulary. In addition, the members of the COAR Editorial Board conduct desktop research to find other related vocabularies with whom to match in newer versions. Both activities can be highly time consuming and therefore COAR welcomes active notification from third party vocabularies whenever there is a change to their service that may effect current mappings.