Technology Readiness Levels Technology Readiness Level Std dey Conceptual design formulate High >25 Conceptual design tested analytically or Moderate experimental Critical function/characteristic demonstrated Moderate Component or breadboard tested in relevant Moderate 10-15 nvironment 6 Prototype/engineering model tested in relevant Low <10 environment Engineering model tested in space Full operational capability LowTechnology Readiness Levels Technology Readiness Level Definition Risk Std Dev (%) 1 Basic principles observed High >25 2 Conceptual design formulated High >25 3 Conceptual design tested analytically or experimentally Moderate 20-25 4 Critical function/characteristic demonstrated Moderate 15-20 5 Component or breadboard tested in relevant environment Moderate 10-15 6 Prototype/engineering model tested in relevant environment Low <10 7 Engineering model tested in space Low <10 8 Full operational capability Low <10