TRL Levels

TRL 1: Basic principles observed and reported

TRL 2: Technology concept and/or application formulated

TRL 3: Analytical and experimental critical function and/or characteristic proof of concept

TRL 4: Component and/or breadboard validation in laboratory environment

TRL 5: Component and/or breadboard validation in relevant environment

TRL 6: System/subsystem model or prototype demonstration in a relevant environment

TRL 7: System prototype demonstration in an operational environment.

TRL 8: Actual system completed and qualified through test and demonstration.

TRL 9: Actual system proven through successful mission operations.