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I am on an email distro for “Studio Binder.com” and they sent a great blog post titled “What is a Proof-of-Concept Film - Examples and Strategies.” StudioBinder.com provided the following definition: "A smaller sample of what an eventual (often larger) project might look like. In film and television, a proof of concept is a short film composed of scenes that best represent the concept, story, tone and themes of a potential feature film or television series. A proof of concept not only demonstrates the potential of a feature film or television series, but also the skill and vision of a director and/or screenwriter.”