National Highway Safety Administration (NHTSA)’s seat back standard FMVSS No. 207  establishes a minimum strength requirement to reduce occurrence of seat back collapse in rear crash events. NHTSA also has a separate standard for head restraints. FMVSS No. 202a, that is intended to mitigate whiplash injuries in rear end crashes. In general, seat backs in current production vehicles will not significantly deform or collapse when subjected to the FMVSS No. 202a test pulse. Thus, a more severe test impulse would be needed to demonstrate a change in seat back performance in a rear impact. Recently rear crash events had fatal injuries to rear seat occupants that was attributed to the collapse of a front seat back. This study was to study seat back design changes that could reduce seat back motion in high speed rear impact . The Bio-RID II dummy was used for testing and simulation in this study. This paper provides details of seat back strength changes from a baseline 2014 Honda Accord.