Proceedings of the 13th Workshop on Foundations of Aspect-Oriented Languages, FOAL 2014, April 22, 2014, Lugano, Switzerland

It is with pleasure that we welcome you to the 13th Foundations of Aspect-Oriented Languages Workshop -- FOAL 2014. This workshop has always played an important role as a productive meeting place for researchers striving to break new ground in the formal modeling of programming languages and other systems supporting advanced modularity mechanisms. This year's edition is the first to be associated with the conference under the name MODULARITY, which has deliberately broadened its scope in comparison with previous years. This also reflects in submissions to FOAL. We have papers covering several areas, bringing together such different topics as event-based programming, context-oriented programming and more. Putting together FOAL 2014 was the joint effort of many people. We thank the authors for providing the content of the program, and the program committee for working hard to review papers and provide feedback for authors. Finally, we thank the MODULARITY 2014 organizers for the smooth collaboration and for establishing the context in which FOAL will take place. We hope that you will find this workshop inspiring and enjoyable, and that it will provide you with plenty of opportunities to share ideas with other researchers and practitioners from around the world.