Advanced high strength steels (AHSSs) have complex microstructures, with two or more phases, to produce particular blends of desired properties (strength and ductility). Many of these grades, such as TRIP-assisted steels, feature metastable retained austenite that transforms into martensite as a result of plastic straining. This transformation is very important to the behaviors of these steels, since it increases the work hardening rate and resistance to necking. This work presents a novel, fast and accurate technique for measuring the transformation kinetics curves for several AHSSs. Digital image correlation (DIC) is coupled with the dynamic tensile testing / synchrotron diffraction measurement setup at Argonne National Lab – APS Beamline 11-ID-C. True strains are accurately measured at the exact location of the Synchrotron beam and are coupled to the austenite volume fraction values extracted from HEXRD measurements. Different steel grades, with various chemistries, microstructures and initial volume fractions of austenite, are investigated.