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Review of Directed Energy Technology for Countering Rockets, Artillery, and Mortars (RAM): Abbreviated Version Appendix D Definitions of Technology Readiness Levels TABLE D-1 Definitions of Technology Readiness Levels (TRLs) TRL Definition Level 1 Basic principles observed and reported Level 2 Technology concept and/or application formulated Level 3 Analytical and experimental critical function and/or characteristic proof of concept Level 4 Component and/or breadboarda validation in laboratory environment Level 5 Component and/or breadboard validation in a relevant environment Level 6 System/subsystem model or prototype demonstration in a relevant environment (ground or space) Level 7 System prototype demonstration in an operational (space) environment Level 8 Actual system completed and (flight) qualified through test demonstration (ground and space) Level 9 Actual system (flight) proven through successful mission operations aTemporary prototype of an electronic circuit used for experimenting with circuit designs.