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After a critical review of the present architecture of SNOMED CT, addressing both logical and ontological issues, we present a roadmap toward an overall improvement and recommend the following actions: SNOMED CT's ontology, dictionary, and information model components should be kept separate. SNOMED CT's upper level should be re-arranged according to a standard upper level ontology. SNOMED CT concepts should be assigned to the four disjoint groups: classes, instances, relations, anddoi:10.1016/j.ijmedinf.2008.06.004 pmid:18789754 fatcat:tmkxa4ptmjcrpkmkuggj64wd54