||The principle of complementarity, as applied to the Interpersonal Circumplex, states that behaviors along the affiliation dimension "pull" for correspondence (i.e., match) from interaction partners, while behaviors along the control dimension pull for reciprocity (i.e., opposite). Interpersonal theory further proposes that complementary interactions are associated with less anger and anxiety, as partners' interpersonal stances are affirmed, and that this reduction in negative affect makes relationship satisfaction and continuance more likely. The present studies examined the presence of complementarity as well as proposed affective and relationship correlates of complementarity in the important context of marriage while appropriately accounting for first-order effects of affiliation and control in relation to these outcomes. We examined aggregate behavioral complementarity and its correlates using multiple methods of assessment (e.g., selfreports, observer ratings, partner ratings). We also examined potential contextual moderators such as the tone and focus of marital interactions. While we found strong support for affiliative complementarity, the presence of complementarity along the control dimension was less reliable. Additionally, results revealed that first-order effects of affiliation and control predicted affect and relationship quality, not complementarity (e.g., match or mismatch of these behaviors).