Part I: Review Articles. Transitions between Spatio- Temporal Patterns in Non Equilibrium Systems; D. Walgraef. Galilean and Relativistic Nonlinear Wave Equations: An Hydrodynamic Tool?; M. Abid, et al. Part II: Instabilities and Pattern Formation. Chaotically Induced Defect Diffusion; P. Coullet, K. Emilsson. Pattern Formation and Phase Turbulence in the Transverse Section of Lasers; G. Juyet, S. Rica. Long Wavelength Oscillatory Instability in Binary Fluids; T. Clude, et al. Multiple Front Propagation in a Potential Non-Gradient System; M. San Miguel, et al. Pattern Selection and Diffusive Instability; M.F. Hilali, et al. Monotonic Fronts of the Reaction-Diffusion Equation in One Space Dimension; R.D. Benguria, M.C. Depassier. Poiseuille Flux of Hard Particles: Theory and Simulations; D. Risso, P. Cordero. Stationary Convection Due to Resistivity and Viscosity in a Cylindrical Plasma with a Free Boundary; L. Gomberoff. Ginzburg-Landau Equation for Oscillatory Convection in Oldroyd-B Fluids; J. Martinez-Mardones, et al. Laser Model with Periodic External Injected Signal and Noise: Small Net Gain Limit; R.C. Buceta, et al. Flow Transitions in Rayleigh-Benard Convection: Influence of Heating Rate; R. Hernandez. Part III: Stochastic Effects. Noise Induced Phase Transitions; J.M.R. Parrondo, C. van den Broeck. Competitive Coexistence in Biological Systems: Exact Analytical Results Through a Quantum Mechanical Analogy; H.S. Wio, et al. Effects of Disorder on Reaction- Diffusion Systems: An Analytical Approach; M.A. Rodriguez. Concerning the Noise Strength in Periodically Driven Pattern Convection; M.O. Caceres. Quasi- Stationary Distribution and Gibbs Measure of Expanding Systems; P.Collet, et al. Detailed Balance and Reversed Process for Macroscopic Systems; F. Barra, et al. Part IV: Statistical Mechanics and Applications. Substantial Irreversibility in Quantum Cosmology; M. Castagnino, et al. Generalized Spectral Decomposition for a Class of One-Dimensional Chaotic Maps; D.J. Driebe, H.H. Hasegawa. Two Photon Micromaser: From Trapping to Ideal Squeezed States; M. Orzag, et al. Thermodynamic Instabilities in Quantum Liquids; E.S. Hernandez. Construction of Hamiltonian Structures for Dynamical Systems from Scratch; S.A. Hojman. Part V: Granular Matter. A Visit of Granular Matter; E. Guyon, J.P. Troadex. A Dissipative Model for Parametric Waves in Granular Materials; E. Cerda, F. Melo. Simple Models for Fragmentation; G. Hernandez, et al. Part VI: Short Communications. Chaos and Three-Frequency Resonances in a Dynamical System; S. Blanco, et al. Shape Transition in a Two-Dimension System of Bubbles; V.A. Kuz. Nonlinear Behavior and Trapped Dynamics in the Micromaser; E. Lazo, et al. Analytical Study of the Codimension two Bifurcations of the New Lorenz System; A.C. Sicardo Schifino, C. Masoller. A New Basis of Wavelets for Studying Three Periodic Attractors; A. Figliola, E. Serrano. Trehalose in Solution and Its Interaction with Water and Biological Structures. Molecular Dynamics Simulation; M.C. Donnamaria, J.R. Grigera. Subject Index.