Evaluations of 20 seating environments were conducted using rating scales, subjective probabilities, and adjective check lists with a representative driver population to develop reliable indices of psychological seating comfort. Concurrent measurable physiologic variations were also recorded to determine relationship patterns. Primary psychological descriptors were identified for each seating environment. Subjective data was compared with physiological data and SAE seat dimensioning findings. Multivariate canonical correlation analyses of 32 variables are reported, as are subjective profiles for each seating environment.