The colloquium will cover aspects of dynamics (wave propagation) in structured solid materials. It will focus on the mechanics and physics of media with microstructures of varied origin and non-linear effects related to or interacting with the microstructure. Particular attention will be paid to phase transition front propagation in crystalline substances, propagation of solitary waves in micro-structured media and the non-linear acousto-diagnostics of properties of such materials. Under discussion are shape-memory alloys, crystalline solids, inhomogeneous and micro-damaged materials. Theoretical, experimental and numerical studies will be considered. Discussion should lead to a better understanding of the physical phenomena which affect wave propagation in micro-structured solids and indicate effective methods for analysing these phenomena. The colloquium may be considered as a sequel to EUROMECH 348, 1996, and will reflect progress made since that meeting.