This book constitutes the proceedings of the 19th International Conference on Descriptional
Complexity of Formal Systems DCFS 2017 held in Milano Italy in July 2017. The 20 full
papers presented together with 4 invited talks were carefully reviewed and selected from 26
submissions.Descriptional Complexity is a field in Computer Science that deals with the size of
all kinds of objects that occur in computational models such as turing machines finite
automata grammars splicing systems and others. The topics of this conference are related to
all aspects of descriptional complexity.
