First, the analytic models used to characterize informant discrepancies allow researchers to determine the incremental value of informant discrepancies, relative to the informants' reports used to describe the discrepancies. Observations About Informant Discrepancies Observation #1: I B Informant discrepancies commonly manifest when comparing multiple informants' reports about youth mental health. b i In three key respects, the 60 years of research on informant discrepancies provides us with a great deal of data about this clinical phenomenon. This means that whether researchers detect domain-relevant information in informant discrepancies may be dictated by their practices for selecting (a) multi-informant instruments to assess youth mental health domains, and (b) validity criteria for detecting domain-relevant informant discrepancies. [Extracted from the article]