Abstract: Proceedings of the International Workshop on Formal Aspects of Testing and Runtime Verification (FATES/RV) Manuel Núñez García and Klaus Havelund and Grigore Rosu and Burkhart Wolff This book constitutes the refereed proceedings of the International Workshop on Formal Aspects of Testing and Runtime Verification, FATES/RV 2006, held in Seattle, USA in August 2006 in conjuction with FLoC. The 14 revised full papers presented together with twoinvited papers were carefully reviewed and selected from 34 submissions.