Al-Ramahurmuzi authored *al-Muhaddith al-Fasil*, an important early specialized work, though it did not comprehensively cover every topic of the discipline.
Al-Hakim al-Naysaburi wrote *Maʿrifat ʿUlum al-Hadith*, gathering many technical discussions while leaving room for more systematic refinement.
Abu Nuʿaym al-Isfahani supplemented al-Hakim's work through an *al-Mustakhraj*, yet further matters remained to be treated.
This sequence shows how scholarly literature grows: later contributions draw on earlier collections, improve their organization, and address subjects not yet adequately developed.