1. Effective methods in D-modules. 1.1. Motivations and introduction to the theory of D-modules / B. Malgrange. 1.2. D-modules: an overview towards effectivity / Ph. Maisonobe -- 2. Theoretical aspects in dynamical systems. 2.1. Introduction to the Ecalle theory / E. Delabaere. 2.2. Perturbation analysis of nonlinear systems / K. R. Meyer -- 3. Normal forms. 3.1. Normal forms of differential systems / J. Della Dora, L. Stolovitch. 3.2. Versal normal form computation and representation theory / J. A. Sanders. 3.3. Painleve analysis and normal forms / L. Brenig and A. Goriely. 3.4. Normal forms and Stokes multipliers of nonlinear meromorphic differential equations / Y. Sibuya.