A 2 x 2 (Instructor Self-Disclosure/No Disclosure x Pair-Share/No Pair-Share) repeated-measures analysis of variance of the combined mid-term exam scores resulted in a significant main effect for the variable instructor self-disclosure/no disclosure, F(1, 186) = 69.22, p < .001. The magnitude-of-effect estimate indicated a moderate effect, h2 = .27. Exam performance was better when lectures included instructor self-disclosure.