General aspects of modeling as an engineering tool are presented in this work. The usefulness of Takagi-Sugeno Fuzzy Inference Systems (TS FIS) as modeling technique are emphasized. Additionally, various modifications of known methodology for identifying such a models and rules configuration are proposed. Finally, two application examples are presented. The first one is a modeling of the Box and Jenkins gas furnace and the second is a model for a waste water pH neutralization benchmark.
