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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 the RelMiCS series were held in Schloss Dagstuhl (Germany) in January 1994, Parati (Brazil) in July 1995, Hammamet (Tunisia) in January 1997, Warsaw (Poland) in September 1998, Qu´ ebec (Canada) in January 2000, and Oisterwijk (The Netherlands) in October 2001. The conference on Appli- tions of Kleene Algebra started as a workshop, also held in Schloss Dagstuhl, in February2001.Tojointhesetwothemesinoneconferencewasmainlymotivated by the substantial common interests and overlap of the two communities. Over the years this has led to fruitful interactions and openened new and intere- ing research directions. Joint meetings have been held in Malente (Germany) in May 2003, in St Catherines (Canada) in February 2005, in Manchester (UK) in August/September 2006 and in Frauenw¨ orth (Germany) in April 2008. This volume contains 24 contributions by researchersfrom all overthe world.
