Progress is reported at the completion of two years of an interdisciplinary program to investigate and establish modern diagnostic techniques for application to reacting flows. Project areas include: (1) optical probes for species measurements employing tunable ultraviolet, visible and infrared laser sources; (2) coherent anti-Stokes Raman spectroscopy (CARS) for temperature and velocity measurements in a supersonic jet; (3) computed absorption tomography for species measurements in a plane; (4) particle sizing techniques, especially for rocket exhausts; (5) fast-response temperature monitor, based on line-reversal concepts; (6) quantitative flow visualization, including temporally and spatially resolved species measurements in a plane using laser-induced fluorescence; (7) multiple-point velocity visualization; (8) application of modern diagnostics to a two-dimensional reacting shear layer; (9) development of measurement techniques and a novel facility for investigations of droplet evaporation in turbulent flows; (10) holographic display techniques for 3-D visualization of flowfield data; (11) spatially resolved laser absorption spectroscopy using optical Stark shifting; and (12) fast-scanning dye laser for measurements of species, temperature and fundamental spectral parameters. (Author).