In $1999,$ a caused the failure of a NASA satellite. Lockheed Martin, who built the craft, typically expresses force in pounds, but it was standard practice to convert force to newtons for space missions. One pound of force is about $4\mathrm{.}45$ newtons. Engineers at NASA's Jet Propulsion Lab assumed the conversion had been made, and didn't check!

communication error

team$-$building exercise

lack of accountability