This thesis empirically investigates the use of multimodal augmentation as an approach to improving the quantity and quality of force feedback generated textures. A review of haptic interaction issues indicated that haptic effects, such as texture, are being used successfully to convey rich information rather than simply to increase immersion or realism. This review also identified graphical user interaction as a potential application area that remains relatively unexplored and that might benefit from haptic interaction. An investigation was conducted as part of this research to empirically assess the effect on interaction of different haptic effects, including texture, used to augment a conventional desktop graphical user interface (GUI). The results from this work, as well as a review of texture simulation, confirm that texture as a haptic effect has the potential to enhance many applications but that effective simulation of this effect still needs investigation. A set of experiments is presented that empirically investigate the effects of multimodally augmenting a simple model of force feedback texture with simple auditory texture cues. The results showed that judgments of perceived roughness of the force feedback and auditory textures varied as a function of the geometry of the model of the textures. Importantly judging the textures multimodally was also shown to have a significant effect on the perceived roughness of virtual surfaces but that this relationship may be more complex. The thesis shows that multimodally augmenting force feedback effects can serve to improve the quality of interaction available through current force feedback technology.