Modern composite structures make use of the possibilities offered by composite materials to add stiffness and strength only where they are needed and in the direction required. This ability to tailor material properties to the needs of the structure have led to significant weight reductions; they have also allowed one to develop new architectures and design shapes, as composites materials are usually formed at the same time as the part they form. The Liquid Composite Moulding (LCM) family of processes, comprising RTM, CRTM, RTMLight and Resin Infusion VARTM, involves the placement of dry fibrous reinforcement into a mould and then, after closing the mould, injection of liquid resin to impregnate the reinforcement before resin-cure. LCM processes have a number of advantages over other processes; these include control over harmful volatiles, the ability to achieve high and consistent final fibre volume fraction (V f) and their potential for automation, greatly reducing labour costs [1, 2]. During manufacture with an LCM process, the operator typically has little control. Successful process development by trial and error, on the other hand, requires experience and can be time consuming and expensive. Reduction of development costs requires a good understanding of the process physics, and can benefit from development of an accurate simulation tool. Significant effort has been placed into establishment of RTM and CRTM simulations that accurately predict process outcomes, such as fill time, flow front advancement and dry spot formation [3, 4]. SimLCM is a simulation software developed at the University of Auckland to simulate LCM processes. Incorporation of the compaction behaviour of the fibrous reinforcement into the simulation allows for calculation of the tooling forces. Modelling of the reinforcement compaction also allows one to calculate the changes in permeability which occur during compaction, which is necessary for providing accurate simulation of the CRTM process. To determine the compaction and permeability behaviour, a set of experimental characterisation is required. Experimental procedures for reinforcement characterisation were devised and presented in [5-8] and [8, 9], respectively, for the compaction and permeability. Using these