Aerospace glossary
Technology readiness level
A 1–9 scale, developed at NASA, for how mature a technology is, from basic principles observed to proven in operation. Agencies and investors use it to judge development risk.
| TRL | Meaning |
|---|---|
| 1 | Basic principles observed |
| 2 | Concept formulated |
| 3 | Proof of concept |
| 4 | Validated in the lab |
| 5 | Validated in a relevant environment |
| 6 | Prototype demonstrated in a relevant environment |
| 7 | Prototype demonstrated in an operational environment |
| 8 | System complete and qualified |
| 9 | Proven in operation |
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