The purpose of this research was to develop a structural equation model that tested the effects of emotional reactivity on the relational health of a representative sample of 736 premarital couples. We hypothesized that partners' perceived family-of-origin experience would be predictive of partners' reports of their own and their partners' emotional reactivity. These reports were hypothesized to predict partners' reports of their own and their partners' ability to manage conflict, which were hypothesized to predict relationship satisfaction. Overall, the model fit the data quite well, with particularly interesting differences by gender. We discuss the model's fit within the larger body of literature, the potential implications and limitations of our findings, and future research considerations.A common problem routinely presented to marriage and family therapists is marital conflict. One of the most widely replicated findings in the study of couple and marital relationships is the primacy of negative affect. Across methodologies (e.g., observational vs. survey, cross-sectional vs. longitudinal) and samples (e.g., premarital, newly-married, long-term married), negative emotionality or emotional reactivity has been shown to be a Electronic Supplementary Material The online version of this article (