Proof of concept
A proof of concept (PoC) or a proof of principle is a realization of a certain method or idea to demonstrate its feasibility, or a demonstration in principle, whose purpose is to verify that some concept or theory has the potential of being used. A proof of concept is usually small and may or may not be complete.
Usage history
The appearance of the terms in news archives suggests it might have been in common use as long ago as 1973.
One of the early definitions of the term "proof of concept" was by Bruce Carsten in the context of a "proof of concept prototype" in the column "Carsten's Corner":
The column also provided definitions for the related but distinct terms 'breadboard', 'prototype', 'engineering prototype', and 'brassboard'
Examples
Filmmaking
Sky Captain and the World of Tomorrow, 300, and Sin City were all shot in front of a greenscreen with almost all backgrounds and props computer-generated. All three used proof-of-concept short films. In the case of Sin City, the short film became the prologue of the final film.