This investigation was designed to describe characteristics of closeness in the romantic relationships of early, mid-, and late adolescents, and to determine whether adolescent reports of relationship authority and reciprocity are linked to perceptions of interdependence, interaction frequency, activity diversity, influence, and relationship duration. Age was positively associated with interdependence, daily social interaction, weekly activity diversity, and reciprocity but not with influence, authority, or relationship duration; gender was unrelated to all characteristics of closeness. Authority and reciprocity were each positively associated with relationship influence. Authority moderated associations between reciprocity and several characteristics of closeness such that reciprocity was positively linked to interdependence, daily social interaction, and weekly activity diversity, but only in relationships characterized by low levels of authority. Neither reciprocity nor authority was associated with relationship duration.During childhood, close relationships tend to be limited to family members and friends, but during adolescence a new close relationship emerges: The romantic relationship. Closeness, is an important index of relationship quality has been studied extensively among adults, especially in the context of heterosexual relationships (see Clark and Reis, 1988, for review). Participants who perceive their relationship to be high in closeness report more satisfaction than those who perceive their relationship to be low in closeness (Aron, Aron, Smollan, 1992). Close relationships are also more stable and less likely to terminate than less close relationships (Berscheid, Snyder, & Omoto, 1989a). It is somewhat surprising, therefore, that little is known about closeness in romantic relationships during adolescence. The present study was designed to describe adolescent romantic relationships on several dimensions of closeness and to determine whether patterns of closeness vary across the adolescent years. Berscheid, Snyder, & Omoto, 1989b). Frequency describes the amount of social interaction between participants. Diversity describes the extent to which participants engage in different types of social interchanges. Strength of influence describes the degree to which exchanges affect the participants. Duration describes the time period over which participants have maintained interconnections. In close relationships, participants engage in frequent social interaction, share a variety of different activities together, and shape one another's thoughts and behaviors through exchanges that are maintained over time and across space. Developmental alterations in interdependence have been noted. Considerable evidence supports the notion that, with age, adolescents spend more time with agemates and less time with family members (Larson & Richards, 1991). Yet even as peer influence increases across adolescence, parents remain the more influential relationship (Berndt, 1999). Evidence suggests that patterns...