TRLs got great press because a number of companies had to use them to report progress and needed to achieve various TRL levels to receive payment. So TRLs hit the ground running. NASA and other agencies loved them. The test of TRLs would be if they moved outside that sphere.
Many global defense companies, GE, Rolls-Royce, United Technologies, Boeing, and others have a good chunk of their business outside that sphere. Quickly after the technique was adopted it spread to the commercial
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