First International Workshop on Rough Sets - State of the Art and Perspectives. Kiekrz-Poznan, Poland, September 2-4, 1992.

International Workshop on Rough Sets, Fuzzy Sets and Knowledge Discovery (RSKD'93). Banff, Canada, October 12-15, 1993.

International Workshop on Rough Sets Soft Computing (RSSC'94). San Jose, USA, November 10-12, 1994.

International Workshop on Rough Sets, Fuzzy Sets and Machine Discovery (RSFD'96). Tokyo, Japan, November 6-8, 1996.

First International Conference on Rough Sets and Soft Computing (RSCTC'98). Warszawa, Poland, June 22-27, 1998.

International Workshop on New Directions in Rough Sets, Data Mining, and Granular-Soft Computing (RSFDGrC'99). Yamaguchi, Japan, November 9-11 1999.

Second International Conference on Rough Sets and New Trends in Computing (RSCTC'2000). Banff, Canada, October 16-19, 2000.

International Workshop on Rough Set Theory and Granular Computing (RSGrC'2001), Matsue City, Japan, May 20-25, 2001.

Third International Conference on Rough Sets and New Trends in Computing (RSCTC'2002). Malvern, USA, October 14-16, 2002.

International Conference on Rough Sets, Fuzzy Sets, Data Mining and Granular Computing (RSFDGrC'2003), Chongqing, China, May 26-29, 2003.

Fourth International Conference on Rough Sets and Current Trends in Computing (RSCTC'2004). Uppsala, Sweden, June 1-5, 2004.

International Conference on Rough Sets, Fuzzy Sets, Data Mining and Granular Computing (RSFDGrC'2005). Regina, Canada, September 1-3, 2005.

International Conference on Rough Sets and Knowledge Technology (RSKT'2006). Chongqing, China, July 24-26, 2006.

Fifth International Conference on Rough Sets and Current Trends in Computing (RSCTC'2006). Kobe, Japan, November 6-8, 2006.