Proceedings / Fifteenth National Conference on Artificial Intelligence (AAAI-98), Tenth Innovative Applications of Artificial Intelligence Conference (IAAI-98). [July 26-30, 1998 ; Madison, Wisconsin] - National Conference on Artificial Intelligence (15 : 1998 : Madison, Wis.); Conference on Innovative Applications of Artificial Intelligence (10 : 1998 : Madison, Wis.) (AAAI Press [u.a.], 1998)