Answer: Informants seldom agree perfectly in their reports of people’s functioning. One reason for obtaining ratings of similar items from multiple informants is to identify both the agreements and disagreements between particular informants. If specific disagreements are found, these can be investigated to determine whether the informants differ in their judgments of similar behavior or whether they differ in what they see or in their willingness to report problems that they see. Besides identifying specific agreements and disagreements, the Ages 60-90+ Module displays Q correlations between item scores obtained from each pair of informants. The Q correlations can identify exceptionally low levels of agreement that can then be investigated via interviews and other means.