**7. Summary**

This opening editorial report is presented for the current *Crystals* journal Special Issue on the topic of "Crystal Plasticity at Micro- and Nano-Scale Dimensions". A number of example references are provided to demonstrate current research interests in the topic. Four particular descriptions of microto nano-strength property evaluations are given and are compared with conventional material strength properties. The dislocation mechanics-based model descriptions of the strength properties are based on the nucleation of dislocations and their interactions at corresponding micro- to nano-scale dimensions.

**Author Contributions:** This editorial has been jointly written by both co-authors. All authors have read and agreed to the published version of the manuscript.

**Acknowledgments:** The authors express appreciation to Dancy Yu for editorial assistance.

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