About International Rough Set Society (IRSS)

International Rough Set Society (IRSS) is a non-profit organisation intended as a forum for contacts and exchange of information between members of scientific community whose research is related to the Rough Set Theory.


The International Rough Set Society (IRSS) was reorganized in 2005.

The latest IRSS Constitution and Bylaws were approved in 2011.

They are available for download in PDF format.

The next elections for IRSS Officers will be held in 2018.



Former IRSS Presidents


  1. Tsau Young Lin (USA) - Founding President
  2. Andrzej Skowron (Poland)
  3. Shusaku Tsumoto (Japan)
  4. Wojciech Ziarko (Canada)
  5. Roman Słowiński (Poland)
  6. Dominik Ślęzak (Poland)
  7. Guoyin Wang (China)