A basic organizing question is: How many transmission routes bring this report to us? The first major division separates reports meeting the conditions of tawatur from reports that do not.
The first category is mutawatir; the broader second category is ahad. The word ahad in this classification does not necessarily mean “narrated by exactly one person.” Reports with several routes may still fall short of tawatur.
Illustration: Several distinct isnads may exist for a report without producing the certainty required for tawatur. Multiplicity alone therefore does not settle its classification.