Neutron diffraction is a unique technique for non-destructive strain m
easurement within crystalline solids. The technique has achieved recog
nition but is limited by lack of beam time and the compromises involve
d in using instruments designed for powder diffraction. This paper sum
marizes its importance, lists the capabilities of the Los Alamos (puls
ed) neutron scattering center (LANSCE) and briefly describes a concept
ual dedicated instrument.