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Normal Accidents: Living with High-Risk Technologies is a 1984 book by Yale sociologist Charles Perrow, which analyses complex systems from a sociological perspective.. Perrow argues that multiple and unexpected failures are built into society's complex and tightly coupled systems, and that accidents are unavoidable and cannot be designed a
The history of écoles normales supérieures goes back to 30 October 1794 (9 brumaire an III), when École normale de l'an III was established during the French Revolution. [2] The school was subsequently reestablished as pensionnat normal from 1808 to 1822, before being recreated in 1826 and taking the name of École normale in 1830.