This book constitutes the refereed proceedings of the 17th International Conference on
Descriptional Complexity of Formal Systems DCFS 2015 held in Waterloo ON Canada in June
2015. The 23 full papers presented together with 2 invited talks were carefully reviewed and
selected from 29 submissions. The subject of the workshop was descriptional complexity. Roughly
speaking this field is concerned with the size of objects in various mathematical models of
computation such as finite automata pushdown automata and Turing machines. Descriptional
complexity serves as a theoretical representation of physical realizations such as the
engineering complexity of computer software and hardware. It also models similar complexity
phenomena in other areas of computer science including unconventional computing and
bioinformatics.
