Bulletin of International Rough Set Society (ISSN 1346-0013)
Volume 6, Number 1/2 
October, 2002

Editor in Chief: S. Tsumoto


Edited by S. Tsumoto and Y.Y. Yao


Table of Contents

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Papers

Towards an Ontology of Approximate Reason
J.F. Peters, A. Skowron, J. Stepaniuk and S. Rammana .......................................... 1

The Lattice Structure of Databases and Mining Multiple Level Rules
T.Y. Lin ..................................................................................... 31


Workshop Introduction and Abstracts

Foundation of Data Mining via Granular and Rough Computing
(COMPSSAC 2002 Workshop Introduction)
S. Tsumoto, T.Y. Lin and J.F. Peters ......................................................... 17

COMPSAC 2002 Abstracts  ...................................................................... 19

Rough Set Rudiments
Z. Pawlak and A. Skowron  .................................................................... 27

IRSS Calendar ................................................................................ 32

Instruction to Authors
S. Tsumoto