More Than Just Bad Luck
Edward A. Murphy Jr. is perhaps the most quoted engineer in history, though often for the wrong reasons. While "Murphy's Law" is commonly used to describe bad luck, Murphy himself was a serious development engineer for the U.S. Air Force. His work focused on safety-critical systems, where a single mistake could cost lives.
The Rocket Sled Incident
The legend began in 1949 at Edwards Air Force Base. Murphy was working on Project MX981, a series of tests designed to see how much G-force a human pilot could survive. The test subject was the legendary Dr. John Stapp, who strapped himself into a rocket sled nicknamed "Gee Whiz." To measure the forces, Murphy brought a set of new electronic sensors.
The Birth of the Law
After a grueling run, the sensors recorded... zero. Upon inspection, Murphy discovered that every single one of the 16 sensors had been wired backwards. Frustrated, he reportedly said of the technician responsible: "If there is any way to do it wrong, he will." Dr. Stapp later quoted this in a press conference as "Murphy's Law," crediting their survival to checking for every possible error. Thus, a principle of defensive designâassuming that users will make mistakes and designing around themâwas born.