This book contains the thoroughly refereed papers from the 9th International Ershov Informatics
Conference PSI 2014 held in St. Petersburg Russia in June 2014. The 17 revised full papers
11 revised short papers and 2 system and experimental papers presented in this book were
carefully reviewed and selected from 80 submissions. The volume also contains 5 keynote talks
which cover a range of hot topics in computer science and informatics. The papers cover various
topics related to the foundations of program and system development and analysis programming
methodology and software engineering and information technologies.
