Discovery Science : Second International Conference DS’99 Tokyo Japan December 6–8 1999 Proceedings This book constitutes the refereed proceedings of the Second International Conference on Discovery Science DS99 held in Tokyo Japan in December 1999. The 26 revised full papers presented together with 2 invited contributions and 25 poster presentations were carefully reviewed and selected from a total of 74 submissions. The following topics are covered in their relation to discovery science: logic inference algorithmic learning heuristic search database management data mining networking inductive logic programming abductive reasoning machine learning constructive programming intelligent agents statistical methods visualization HCI etc