The notion of particularism is used in this study to relate the choice of reciprocal action to the previous exchange situation. Initial encounters were manipulated by exposing 80 female subjects to affective and monetary outcomes provided by 2 male peers. Treatment conditions varyed in feedback level (high vs. low) and mode of interaction (positive vs. negative). Subjects were provided a subsequent opportunity to choose one of four reciprocation options pairing a preferred target person with either resource class. Choice patterns revealed an ordered contingency matrix reflecting a systematic tendancy for subjects to match the particularity of their action to the particularism of prior encounters. The findings are described in terms of a structural taxonomy of social exchange.