Knowledge representation (Information theory) Artificial intelligence 4 LISP (Computer program language) 4 Problem solving 4 Prolog (Computer program language) 4 Information organization 2 Information retrieval 2 Ontologies (Information retrieval) 2 Reasoning 2 Artificial intelligence - Mathematics 1 Conceptual structures (Information theory) 1 Congresses 1 Expert systems (Computer science) 1 Information science 1 Information storage and retrieval systems 1 Semantic networks (Information theory) 1 Software engineering 1