What followed was a generational evolution. First‑generation CRM (early 1980s) focused on changing attitudes and awareness. Second‑generation courses (mid‑1980s, led by Delta and Pan Am) tackled group dynamics and shed the pop‑psychology jargon. Third‑generation CRM (early 1990s) broadened the scope to cabin crews, dispatchers, and maintenance personnel. Fourth‑generation CRM (institutionalized through the FAA’s Advanced Qualification Program in 1990) integrated human‑factors training with technical skills and required formal evaluation. Fifth‑generation CRM, influenced by James Reason’s work on human error, reframed the mission as “error management”: avoiding error, trapping it, and mitigating its consequences. By March 19, 1998, CRM training became a regulatory requirement for all Part 121 flight crewmembers in the United States. The revolution that began with a single NTSB recommendation had become the global language of flight safety.