**Preface to "Fuzzy Techniques for Decision Making 2018"**

This book contains the successful invited submissions for the Special Issue of Symmetry on the subject of "Fuzzy Techniques for Decision Making 2018". We invited contributions addressing novel techniques and tools for decision making (e.g., group or multi-criteria decision making), with notions that overcome the problem of finding the membership degree of each element in Zadeh's original model. We were able to attract interesting articles in a variety of setups as well as applications. As a result, this Special Issue includes some novel techniques and tools for making decisions, such as—instrumental tools for analysis, like the approximation of ordered fuzzy numbers or distance measures and aggregation operators in various settings, novel contributions to methodologies, like programming-based algorithms or TOPSIS, new methodologies for hybrid models which are inclusive of new models (picture hesitant fuzzy sets) and theoretical novelties (intertemporal choices in the context of fuzzy soft sets), applications to assessment of enterprise performance, (green) supplier selection, risk level evaluation, arctic route planning, measurement of customer loyalty, contractors' bidding decisions, automatic parking methods, emergency decisions, selection of mine ventilation systems, or medical diagnosis. The response to our call for papers had the following statistics: submissions (63); publications (38); rejections (25); article types: research article (38). The published submissions are related to various settings, such as linguistic term sets, fuzzy soft sets, hesitant fuzzy sets, (fuzzy) soft rough sets, and neutrosophic sets, as well as other hybrid models. I have found the edition and selections of papers for this book very inspiring and rewarding. I also thank the editorial staff and reviewers for their efforts and help during the process.

> **Jos´e Carlos R. Alcantud** *Special Issue Editor*
