The black students involved with the study give different answers to the survey questions based on the state of mind they’re in after taking the test. This illustrates an important concept in social psychology—the “operational definition.” Steele doesn’t have any way of understanding exactly what his subjects are thinking, but he can approximate their thoughts through the survey, advancing a makeshift, “operational’ definition of their feelings of being stereotyped. Based on these results, Steele sees that black students’ performances are impaired by stereotypes—but not in the uniform, unalterable way that previous social psychologists have described.