Editorial

The relevance of relevance☆

The editors thank AAAI for allowing us to organize the very successful Fall Symposium, which showed the community's interest in the topic and prompted us to organize this special issue. We also thank the dozens of reviewers who helped us to maintain high standards in producing this issue.

Current address: Department of Computing Science, 615 General Service Bldg., University of Alberta, Edmonton, Alberta, Canada T6G 2H1.