The discussion identifies three main patterns in which corroboration may strengthen a report, each for a different reason.
1. Particular narrations in the two Sahih collections: non-mutawatir reports accompanied by the standing of al-Bukhari and Muslim, their critical expertise, and scholarly acceptance, subject to stated qualifications.
2. Mashhur with genuinely distinct sound routes: several channels that are free from effective narrator weakness and hidden defects.
3. Chains through accomplished hadith masters: distinguished critical transmitters occurring in relevant stages, without the report being merely singular.
The three are different types of supporting evidence. A report need not exhibit all three; in a particular case, however, their effects may be combined.