| TRL | Description |
|---|---|
| 1 | Basic principles observed and reported |
| 2 | Technology concept and/or applications formulated |
| 3 | Critical function and/or proof of concept |
| 4 | Component validation in laboratory environment |
| 5 | Laboratory scale validation |
| 6 | Pilot-scale prototype validation in relevant environment |
| 7 | Full-scale prototype demonstrated in relevant environment |
| 8 | Test and demonstration of completed system |
| 9 | System operations |
SOURCE: GAO. 2020. Technology Readiness Assessment Guide: Best Practices for Evaluating the Readiness of Technology for Use in Acquisition Programs and Projects. GAO-20-48G.
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