The idea to organize a conference aimed at integrating the local and international communities working with fuzzy sets and related topics originated in Rzeszów (Poland), in 2014. Specifically, a group led by Professor Józef Drewniak, including Urszula Bentkowska, Paweł Drygaś, Anna Król, Barbara Pękala, and Ewa Rak, initiated the organization of an international conference at the University of Rzeszów, focusing on fuzzy set theory, its extensions, and applications. The first symposium under the auspices of POLFUZZ was held in Rzeszów, in 2023.

The symposium became a regular forum for the exchange of scientific ideas among communities from Rzeszów, Warsaw, Poznań, Katowice, and Bratislava, although the participants extended beyond Europe. Since 2017, the conference has been organized in cooperation with the Slovak University of Technology in Bratislava, where the series of seminars is known as Uncertainty Modelling.

The following editions of the symposium took place at the University of Rzeszów:

• The International Symposium On the Eve of Golden Jubilee of Fuzzy Sets (ISFS 2014), November 25, 2014.
• The 2nd International Symposium on Fuzzy Sets (ISFS 2015) – Golden Jubilee of Fuzzy Sets, December 3-4, 2015 (Mathware & Soft Computing Magazine 22, page 25).
• The 3rd International Symposium on Fuzzy Sets (ISFS 2017) – Uncertainty Modelling, May 19-20, 2017.
• The 4th International Symposium on Fuzzy Sets (ISFS 2019) – Uncertainty Modelling, May 23-24, 2019 (Mathware & Soft Computing Magazine 22, page 12).
• The 5th International Symposium on Fuzzy Sets (ISFS 2023), May 19-21, 2023.

The 6th Symposium on Fuzzy Sets is the first edition of the conference that takes place outside of Rzeszów. 

A few photos from previous editions of the event can be found on this website.