Instabilities and patterning in driven materials are two related topics in materials science to which increasing attention has been paid in the past few years, leading to the emergence of a fastly expanding and pluridisciplinary domain. Theoretical approaches as well as simulations have yielded bases for modelling the kinetics and the dynamics of mutually interacting populations of objects, as well as various transitions towards organized configurations far from equilibrium. This is a proceedings volume of the Indo-French Workshop on Instabilities and Patterning and the International Meeting on Non Linear Phenomena in Materials Science, both held in Bangalore, India in December 1994. The book bears witness to the most recent evolution of the subject, and to the emergence of new topics, such as complex dynamics, stick-slip phenomena and approaches by dynamic simulations.