Technology Readiness Levels (TRL) were first defined by NASA in 1989 as a method of classifying the maturity of a technology or product during its development and acquisition. Originally seven in number, this was increased to nine in 1991 and the concept has since been adopted by other organisations. In 2009, the European Commission published a paper entitled ‘Preparing for our future: Developing a common strategy for key enabling technologies in the EU’. This introduced the concept of Key ...
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