**3. Conclusions**

The Special Issue raised the interest of researchers from different scientific schools in Europa, Asia and South America. Researchers from sixteen different countries, including eight international collectives, contributed to the papers published in the issue.

As regards solution models, more than half of the papers proposed multiple-criteria decision-making models. These models mostly covered partly uncertain or entirely uncertain data, integrating crisp MCDM methods with interval-valued fuzzy or neutrosophic sets theory. Therefore, we can conclude that the suggested hybrid decision-making techniques are well applicable to symmetric/asymmetric data modelling.

The application fields of the proposed solution models involved both problems of engineering and management sciences. Supply chain management, construction project management or other civil engineering problems, e-activities, and even problems in the medical field can be marked as application areas that received the most attention.

**Author Contributions:** All authors contributed equally to this work. All authors have read and agreed to the published version of the manuscript.

**Funding:** This research received no external funding.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Data sharing not applicable.

**Acknowledgments:** Authors express their gratitude to the journal *Symmetry*.

**Conflicts of Interest:** The authors declare no conflict of interest.
