Proceedings Eleventh International Workshop on Descriptional Complexity of Formal Systems

The 11th workshop, Descriptional Complexity of Formal Systems 2009, is taking place in Magdeburg, Germany, on July 6-9, 2009. It is jointly organized by the IFIP Working Group 1.2 on Descriptional Complexity and by the Faculty of Computer Science at the Otto von Guericke University Magdeburg. This volume contains the papers of the invited lectures and the accepted contributions.