The investigation of rock and sediment deformation using magnetic fabrics was the main thrust of U.S. work during the past quadrennium. The work focused on understanding the development of magnetic fabric during progressive deformation by (a) the observation of deformed rocks in the field, particularly in strain gradients, (b) laboratory deformation experiments, and (c) numerical modeling of magnetic mineral behavior during progressive deformation. Through all these different approaches the underlying strategic goal was to quantify rock strain using magnetic fabric measurements. In order to achieve this goal much of the work in the past quadrennium has also concentrated on the compositional control of AMS, i.e. the contribution of paramagnetic mineral as well as ferromagnetic mineral content to the intensity of the magnetic fabric.