Vehicle seatback hardness is a common measurement method used to understand the comfort performance of an automotive seat. Set-up of the seat for physical testing plays a critical role in the overall results. This paper looks at the relationship of the overall hardness data results on front driver vehicle seatbacks in a supported and unsupported test set-up condition. Results for seats tested in the unsupported test set-up condition are influenced by any deflection from the structure and recliner mechanism. Seats tested in the supported test set-up condition alleviate this additional noise. While the unsupported method leads to results that include additional influential variables some would argue that this best represents how a customer will experience the seat, as a system, and therefore provides the best correlation to customer data. The supported method offers results that may, from an engineering perspective, lend itself to easier interpretation. This method however may not be as correlated to customer perceptions. Test results comparing the same set of seats tested with both methods will be compared. Recommendations for standardization will be provided.