Preface. Acknowledgments. Author. 1. Introduction. 2. Sources of Uncertainty. 3. Membership Functions and Uncertainty. 4. Case Studies. 5. Singleton Type 1 Fuzzy Logic Systems: No Uncertainties. 6. Centroid of a Type 2 Fuzzy Set: Type Reduction. 7. Modeling of Sustainability. 8. Epilogue. Appendix A: Join, Meet, and Negation Operations for Non-Interval Type 2 Fuzzy Sets. Appendix B: Properties of Type 1 and Type 2 Fuzzy Sets. Appendix C: Computation. Appendix D: Medical Diagnosis by Fuzzy Logic. Appendix E: Fuzzy Logic System Optimized. Appendix F: Heart Disease Demo. Appendix G: Linear Tip Demo, Mamdani Tip Demo, Sugeno Tip Demo. Appendix H: Miscellaneous. Index.