Since the beginning so they are both fuzzy and rough set theory has great sound, good reputation because of their intrinsic ability to model uncertainty coming from the real world. In recent years, widespread use of fuzzy sets and rough as a source of granulation has contributed to putting the two methodologies in a privileged position in Granular Computing, causing a sort of a model which will be much closer to the way people view their environment? This volume is a compilation of the best papers presented at the First International Symposium on Fuzzy and Rough Sets (ISFUROS 2006), held in Santa Clara, Cuba.