Organizational expenditures for interpersonal-skills training have been rising. However, little is known about the translation of cognitive learning into skilled interpersonal-task performance, or about the mechanisms through which interpersonal skills in one domain generalize to other interpersonal tasks. This study used a 2 x 2 experimental design to examine the effectiveness of neutral versus stressful practice conditions and mastery-versus performance-oriented supplemental training for improving cognitive learning and interpersonal-skill transfer to a novel task. Participants who experienced stressful salary-negotiation practice conditions, followed by mastery-oriented supplemental training, showed greater skill transfer when performing a novel task. (i.e., contract negotiations). Results showed that superior cognitive learning (i.e., recall, comprehension, and synthesis) and greater time on task were the mechanisms that supported inter personal-skill transfer for trainees in the stressful practice/mastery-oriented training condition when compared with the other experimental groups. (C) 1998 Academic Press .