Children in sixth grade are also shown to understand equivalent reciprocity. Equivalent reciprocity requires matching the level of intimacy a partner discloses, therefore, a high-intimacy disclosure would be matched with an equally revealing disclosure while a low-intimacy disclosure would be matched with little information revealed. Another type of reciprocity is covariant reciprocity, in which disclosures are more intimate if a partner communicates a high-intimacy disclosure instead of a low-intimacy disclosure. This differs from equivalent reciprocity, which matches the level of intimacy, while covariant reciprocity only focuses on whether someone disclosed something personal or not. Covariant reciprocity is shown to begin in fourth grade.