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Margaret Hamilton is credited with having coined the term software engineering while developing the guidance and navigation system for the Apollo spacecraft.
On May 12, 1941, the very first program-controlled computer, Konrad Zuse's Z3 became operational http://yovisto.blogspot.de/2012/12/konrad-zuse-inventor-of-computer.html
We often think of computers as a very modern phenomenon, but there were actually plenty of computers around 50 years ago. They just weren't an everyman commodity, instead limited to goverment and corporate use. And they certainly weren't small.