Some biographical works target the transmitters occurring in a particular hadith collection. Works on the men of al-Bukhārī or the men of Muslim help identify names as they appear in those specific compilations.
Al-Kalābādhī’s work on al-Bukhārī’s transmitters and Ibn Manjawayh’s work on Muslim’s transmitters illustrate this specialized approach. Other compilations treat the narrators of the Sunan or bring together figures from several collections.
The researcher identifies the source collection, consults its specialized biographical evidence, and then cross-checks against general biographies and parallel isnāds.