Technology Readiness Level (TRL)The ESA Science Technology Development Route Instruments and spacecraft sub-systems technical maturity with respect to a specific space application are classified according to a "Technology Readiness Level" (TRL) on a scale of 1 to 9. ESA is utilising the ISO standard 16290 Space systems – Definition of the Technology Readiness Levels (TRLs) and their criteria assessment.
Last Update: 18 June 2015
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