This proposal aims to further develop neutron strain tomography (NST) into a general tool for three-dimensional strain mapping at the microscale. This is the final stage in the 4 year development cycle of the technique into a mature tool for strain characterisation at time-of-flight neutron sources and represents a collaborative effort by ISIS, La Trobe University (Australia), Oxford University (UK), Rolls Royce (UK) and Berkeley University (USA). The advantages of NST over diffraction are that data collection times are much reduced for equivalent information, it is not limited by collimation, 55 um resolution has been demonstrated and absorption tomography data is simultaneously measured. Excellent results have been obtained from previous experiments (many of which are now published) which indicate the huge potential for NST for three-dimensional arbitrary strain distributions.