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Discover LudwigThe phrase "proof of concept" is correct and commonly used in written English
It typically refers to a demonstration or test of a new idea or concept to show its feasibility or potential success. Example: The team presented their proof of concept for the new app to the investors, showcasing its unique features and potential for widespread use.
Dictionary
Proof of concept
noun
A short and/or incomplete realization of a certain method or idea to demonstrate its feasibility.
Exact(45)
Proof of concept?
Proof of Concept.
Proof of concept: it's already expanded into nearly 15 states.
Proof of concept randomised clinical trial.
It's proof of concept".
"It's a proof of concept".
Similar(14)
Proof-of concept experimental results are provided.
It was a proof-of-concept issue.
(Below, an iPad proof-of-concept app).
"Nature itself provides the proof-of-concept experiment.
Proof-of-concept clinical study.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com