Relative Level of Technology Development	Technology Readiness Level	TRL-Definition
System Operations	TRL 9	Actual system operated over the full range of expected mission conditions.
System Commissioning	TRL 8	Actual system completed and qualified through test and demonstration.
System Commissioning	TRL 7	Full-scale, similar (prototypical) system demonstrated in relevant environment.
	TRL 6	Engineering/pilot-scale, similar (prototypical) system validation in relevant environment.
Technology Development	TRL 5	Laboratory scale, similar system validation in relevant environment.
Technology Development	TRL 4	Component and/or system validation in laboratory environment.
Research to prove feasibility	TRL 3	Analytical experimental critical function and/or characteristic proof of concept.
Research to prove feasibility	TRL 2	Technology concept and/or application formulated.
Basic technology research	TRL 2	Technology concept and/or application formulated.
Basic technology research	TRL 1	Basic principles observed a reported.