Yielding and jamming of dense suspensions

Recent progress in the understanding of yielding and jamming of colloids, based on extensions of the mode coupling theory (MCT) of glasses, is reviewed. This includes schematic extensions to shear-thickening fluids based on the ad-hoc introduction of a stress-dependent vertex in MCT. The possible distinction between dynamic and static yield stress, and its implications for shear-banding and other instabilities, is considered. Finally, what we know about systems where steady stress leads to unsteady flow or vice versa ('' rheochaos '') is briefly summarised.