Conceptual structures (Information theory) Knowledge representation (Information theory) 10 Database design 5 Ontology 5 Artificial intelligence 3 Expert systems (Computer science) 3 Business enterprises 2 Computer networks 2 Ontologies (Information retrieval) 2 Computer science 1 Graph theory 1 Logic diagrams 1 Natural language processing (Computer science) 1 Relational databases 1 Semantic networks (Information theory) 1