Proceedings / Sixteenth National Conference on Artificial Intelligence (AAAI-99), Eleventh Innovative Applications of Artificial Intelligence Conference (IAAI-99) : [July 18 - 22, 1999, Orlando, Florida] - National Conference on Artificial Intelligence (16 : 1999 : Orlando, Fla.); Innovative Applications of Artificial Intelligence Conference (11 : 1999 : Orlando, Fla.) (AAAI Press, 1999)