A number of applied psychologists have suggested that trainability test Black-White ethnic group differences are low or relatively low (e.g., Siegel & Bergman, 1975), though data are scarce. Likewise, there are relatively few estimates of criterion-related validity for trainability tests predicting job performance (cf. Robertson & Downs, 1989). We review and clarify the existing (and limited) literature on Black-White group differences on trainability tests, provide new trainability test data from a recent video-based trainability exam, and present archival data about how trainability test scores relate to cognitive ability, Black-White differences, and job performance. Consistent with hypotheses, our results suggest large correlations of trainability tests with cognitive ability (e.g., 0.80) and larger standardized ethnic group differences than previously thought (ds of 0.86, 1.10, and 1.21 for 3 samples). Results also suggest that trainability tests have higher validity than previously thought. Overall, our analysis provides a substantial amount of data to update our understanding of the use of trainability tests in personnel selection. (Contains 6 footnotes and 3 tables.)