Al-Khatib al-Baghdadi wrote *al-Kifayah* on the principles of transmission and *al-Jamiʿ li-Akhlaq al-Rawi wa-Adab al-Samiʿ* on the conduct of narrators and listeners.
Transmission principles ask what conditions make a report reliable and what qualities matter in its transmitters. Transmission etiquette concerns the disciplined conduct of teachers and students, including listening, preservation, and responsible narration.
For example, a narrator's trustworthiness is an evidentiary requirement, while careful listening and accurate preservation are practical habits that support it. Both are important, but the two aspects should not be conflated.