The hypothesis that people experience greater friendship satisfaction when their friendship matches the prototype of intimacy interactions was tested. Consistent with this hypothesis, both women and men reported the greatest satisfaction when their "real-world" friendship matched the prototype of intimacy interactions. This relation was even stronger when the friendship matched prototypical intimacy interaction patterns (e.g., self-disclosure) than when it matched nonprototypical patterns (e.g., practical support). Thus, there is evidence that people rely on relational knowledge-in this case, complex knowledge of patterns of relating-when evaluating the quality of their friendships.