The French and Guilford-Zimmerman measures of spatial orientation and spatial visualization factors are compared. Both approaches to measurement are described. A study to assess the two approaches is reported. Both tests were administered to 40 college sophomores in a classroom setting according to published instructions. Pearson product-moment correlations were computed for the multitrait-multimethod matrix. Results indicate that both tests exhibit convergent validity. The data on discriminant validation, however, indicates that variance attributable to methods exceeds variance attributable to traits. The conclusion is that variance due to authorship is greater than that due to trait and that the traits may not be distinct variables. (DJ)