Philippe Kruchten, Anne Koziolek, Robert L. Nord: Proceedings of the 9th international ACM SIGSOFT conference on Quality of Software Architectures, QoSA 2013, part of Comparch '13 Federated Events on Component-Based Software Engineering and Software Architecture, Vancouver, BC, Canada, June 17-21, 2013. ACM 2013, ISBN 978-1-4503-2126-6