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Proof of concept
The stage during which proof is obtained that a concept can have a functional application.
A proof of concept (POC) is a small scale demonstration that a certain method or idea is feasible. The proof of concept is usually considered to be an important step in the process of developing a fully functional prototype. For example, in the case of developing a drug, the candidate identified must have proven its efficiency during tests performed on cells taken from patients or on models representing the disease (e.g. a cell, animal, etc.)