The determinants of interpersonal attraction were examined in 10 dyadic situations involving an actor's behavior toward a perceiver. For each situation, the intentionality of the actor's behavior was varied at three levels (intentional, nonintentional, no information), and the affective implications of the behavior for the actor were also varied at three levels (pleasant for the actor, unpleasant for the actor, no information). Subjects (N=144) took the role of the perceiver in each situation and rated their affective response to the behavior of the actor and their liking for the actor in the situation. Data supported the hypothesis that the affective implications for the actor and the intentionality of the actor's behavior in dyadic situations are important determinants of interpersonal attraction; these variables affect liking primarily through their influence on perceiver implications. The identical behavior of the actor may have very different effects on liking, depending upon the affective response and the intent of the actor. Results support an affective conception of liking in dyadic situations. (Author)