Fuzzy sets Fuzzy systems 5 Artificial intelligence 4 Decision making 4 Mathematical models 3 Congresses 2 Expert systems (Computer science) 2 Pattern perception 2 Uncertainty (Information theory) 2 Accounting 1 Control theory 1 Decision-making 1 Economics, Mathematical 1 Equilibrium (Economics) 1 Industrial engineering 1 Intelligent control systems 1 Logic, Symbolic and mathematical 1 Machine learning 1 Managerial accounting 1 Operations research 1 Personnel management 1 Systems engineering 1