This book constitutes the refereed proceedings of the Third International Symposium on Automated Technology for Verificaton and Analysis, ATVA 2006, held in Beijing, China in October 2006.

The 35 revised full papers presented together with abstracts of 3 keynote papers were carefully reviewed and selected from 137 submissions. The papers address theoretical methods to achieve correct software or hardware systems, including both functional and non functional aspects; as well as applications of theory in engineering methods and particular domains and handling of practical problems occurring in tools.