Proceedings of the First International Work- shop on Feature-Oriented Software Develop- ment (FOSD) October 6, 2009 Denver, Colorado, USA Editors: Sven Apel (University of Passau, DE) William R. Cook (University of Texas at Austin, US) Krzysztof Czarnecki (University of Waterloo, CA) Christian K¨astner (University of Magdeburg, DE) Neil Loughran (SINTEF, NO) Oscar Nierstrasz (University of Berne, CH) Proceedings published online in the ACM Digital Library www.acm.org Printed proceedings sponsored by Metop GmbH www.metop.de