Crystal plasticity numerical methods are being used increasingly to model the initiation and propagation of fracture in metals. These models can be more critically evaluated when applied to complex, anisotropic, crystal structures. To validate these models, experimental data are required that characterise the processes of deformation. We propose an experiment to measure the texture change that occurs with the onset of plastic deformation in cast alpha-uranium. This metal has an uncommon (orthorhombic) crystal structure, and exhibits a number of complex twinning systems. The twins are important because their localised shears can cause fracture initiation. We will compare the textures of undeformed and deformed material. The data will allow us to characterise the differences in the populations of twins, and will be compared with crystal plasticity simulations.