This volume contains the proceedings of the 11th International Conference on RelationalMethodsinComputerScience(RelMiCS11)andthe6thInternational Conference on Applications of Kleene Algebra (AKA 6). The joint conference took place in Doha, Quatar, November 1-5, 2009. Its purpose was to bring - gether researchersfrom various subdisciplines of computer science, mathematics and related ?elds who use the calculus of relations and/or Kleene algebra as methodological and conceptual tools in their work. This conference is the joint continuation of two di?erent strands of meetings. The seminars of...