Despite the increased prevalence of neutral third parties in both formal and informal exchange processes, social exchange theory has yet to consider the effect of nonpartisans on important cognitive and affective outcomes of exchange. This research integrates Simmel's conceptualization of small groups and nonpartisans with contemporary theory and research in social exchange to explore how different levels of neutral third party intervention in an exchange process affect the "relational outcomes" of exchange (perceptions of fairness of, general positive regard toward, the exchange partner and optimism about the tone of future interactions). Experimental results indicate that increased third party intervention is "positively" related to favorable relational outcomes. The increased likelihood of external attributions and decreased salience of conflict associated with high levels of third-party intervention partially explain this result.