Basic concepts of category theory applicable to computation and control.- A control theorist looks at abstract nonsense.- A Categorist's view of automata and systems.- Categorical theory of tree processing.- Realization of multilinear and multidecomposable machines.- Fuzzy morphishms in automata theory.- Time-varying systems.- Addressed machines and duality.- Factorization of scott-style automata.- An abstract machine theory for formal language parsers.- Some structural properties of automata defined on groups.- Automata in additive categories with applications to stochastic linear automata.- The algebraic theory of recursive program schemes.- Realization is continuously universal.- Diagram-characterization of recursion.- Power and initial automata in pseudoclosed categories.- Semantics of computation.- Scattering theory and non linear systems.-