CALCO, the Conference on Algebra and Coalgebra in Computer Science, is a high-level, bi-annual conference formed by joining CMCS (the International WorkshoponCoalgebraicMethodsinComputerScience)andWADT(theWo- shoponAlgebraicDevelopmentTechniques).CALCObringstogetherresearchers and practitioners to exchange new results related to foundational aspects and both traditional and emerging uses of algebras and coalgebras in computer s- ence. The study of algebra and coalgebra relates to the data, process and str- tural aspects of software systems. CALCO is supervised by the Steering C- mittee,...