The International Journal of Fuzzy Systems (IJFS) is an official journal of Taiwan Fuzzy Systems Association (TFSA) and is published semi-quarterly. IJFS will consider high-quality papers that deal with the theory, design, and application of fuzzy systems, soft computing systems, grey systems, and extension theory systems ranging from hardware to software. Survey and expository submissions are also welcome. Serves as a popular forum for researchers interested in all kinds of fuzzy related research Publishes regular paper, review, survey, and expository essay Authors can choose between gold OA or subscription publication, based on their preference, funder or institutional requirements