Editing Proof of concept (section)

==Usage history==
The term has been in use since 1967.<ref>"proof, n." OED Online. Oxford University Press, March 2020. Web. 15 April 2020.</ref><ref>{{cite book |year=1967 |title=Aeronautical research and development policy: hearings |url=http://catalog.gpo.gov/F/HRR3ECACEVN92LFJGSU4IQ4THHFR5TR2JM8UBBQ9RXSMC6KD6N-44966?func=full-set-set&set_number=003637&set_entry=000001&format=999 |location=Washington, D.C. , USA |publisher=United States Senate, Ninetieth Congress, first session |page=84  |quote=January 25, 26, and February 27, 1967, review of adequacy of policy planning for aeronautical research and development and of what Congress, Executive Branch of government, and private industry can do to insure that national aeronautical goals are met }}</ref> In a 1969 hearing of the Committee on Science and Astronautics, Subcommittee on Advanced Research and Technology, ''proof of concept'' was defined as following:

{{Quote|The Board defined proof of concept as a phase in development in which experimental hardware is constructed and tested to explore and demonstrate the feasibility of a new concept.<ref>{{cite book |year=1969  |title=Aeronautical Research : hearings before the United States House Committee on Science and Astronautics, Subcommittee on Advanced Research and Technology, Ninety-First Congress, first session |location=Washington, D.C. , USA |publisher=United States Senate, Ninetieth Congress, first session |page=184  |quote=December, 1, 2, 4, 8–11, 1969, |oclc= 853211504}}</ref>}}

One definition of the term "proof of concept" was by Bruce Carsten in the context of a "proof-of-concept prototype" in his magazine column "Carsten's Corner" (1989):

{{quote|Proof-of-Concept Prototype is a term that (I believe) I coined in 1984.  It was used to designate a circuit constructed along lines similar to an engineering prototype, but one in which the intent was only to demonstrate the feasibility of a new circuit and/or a fabrication technique, and was not intended to be an early version of a production design.<ref>Carsten, Bruce. "Carsten's Corner". ''Power Conversion and Intelligent Motion'', November 1989, 38</ref>}}

The column also provided definitions for the related but distinct terms '[[breadboard]]' (a  term used since 1940<ref>"bread, n." OED Online. Oxford University Press, March 2020. Web. 15 April 2020.</ref>), '[[prototype]]', 'engineering prototype', and '[[brassboard]]'.