Host Christopher Naum's two-part series for BuildingsonFire takes a closeup look at building literacy and reshaping decision making on the fireground. This episode explores the operational framework that links building era, construction, occupancy, and functional domains. Naum discusses tactics, safety, and command.   He gets into the importance of the first 20 minutes of an incident, the predictability of building performance, and moving beyond surface familiarity to applied architectural and engineering knowledge.