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The first instances of deformation theory were given by Kodaira and Spencer for complex structures and by Gerstenhaber for associative algebras. Since then, deformation theory has been applied as a useful tool in the study of many other mathematical structures, and even today it plays an important role in many developments of modern mathematics.This volume collects a few selfcontained and peerreviewed papers by experts which present uptodate research topics in algebraic and motivic topology, quantum field theory, algebraic geometry, noncommutative geometry and the deformation theory of Poisson algebras. They originate from activities at the MaxPlanckInstitute for Mathematics and the Hausdorff Center for Mathematics in Bonn.
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