This volume of Lecture Notes in Computer Science contains the revised versions of the papers presented at the 9th International Conference on Implemen- tion and Application of Automata, CIAA 2004. Also included are the extended abstracts of the posters accepted to the conference. The conference was held at Queen's University in Kingston, Ontario, Canada on July 22-24, 2004. As for its predecessors, the theme of CIAA 2004 was the implementation of automata and grammars of all types and their application in other ?elds. The topics of the papers presented at the conference range from applications of automata in natural language and speech processing to protein sequencingandgenecompression, andfromstatecomplexityandnewalgorithms for automata operations to applications of quantum ?nite automata. The25regularpapersand14posterpaperswereselectedfrom62submissions totheconference.EachsubmittedpaperwasevaluatedbyatleastthreeProgram Committee members, with the help of external referees. Based on the referee reports, the paper "Substitutions, Trajectories and Noisy Channels" by L. Kari, S. Konstantinidis and P. Sos ?k was chosen as the winner of the CIAA 2004 Best Paper Award. The award is sponsored by the University of California at Santa Barbara. The authors of the papers presented here come from the following countries and regions: Austria, Canada, Czech Republic, Finland, France, Germany, Hong Kong, Netherlands, Portugal, Russia, Slovakia, South Africa, Spain, UK, and USA."

This book constitutes the thoroughly refereed post-proceedings of the 5th International Conference on Implementation and Application of Automata, CIAA 2000, held in London, Ontario, Canada, in July 2000.The 26 revised full papers presented together with two invited papers and seven abstracts have passed through two rounds of selection and revision. The topics addressed from theoretical as well as application-oriented viewpoints range from automata applications in software engineering, natural language and speech recognition, and image processing to new representations and algorithms for efficient implementation of automata and related structures.

This book constitutes the thoroughly refereed revised post-workshop proceedings of the Second International Workshop on Implementing Automata, WIA'97, held in London, Ontario, Canada, in September 1997.
The book presents 21 revised full papers carefully reviewed and selected for inclusion in the book; also included is an introductory overview. The papers discuss issues involved in the implementation of automata of all types also covering aspects from areas such as natural language processing, pattern matching, speaker recognition, VLSI testing, etc. This book reflects the state-of-the-art in this emerging area of interdisciplinary research.

This book constitutes the strictly refereed post-workshop proceedings of the First International Workshop on Implementing Automata, WIA'96, held in London, Ontario, Canada, in August 1996.
The volume presents 13 revised full papers together with an introduction and survey. The papers explore the use of software tools in formal language theory; various issues involved in the implementation of automata of all types are discussed. As the first book focusing on implementing automata, this collection of research papers defines the state of the art in the area. Generally speaking, the book advocates the practice of theory in computer science.