Table 3.

Technology readiness levels according to the US Department of Defense [7].

Technology readiness level	Description
1	Basic principles observed and reported
2	Technology concept or application formulated
3	Analytical and experimental critical function or characteristic proof of concept
4	Component or breadboard validation in a laboratory environment
5	Component or breadboard validation in a relevant environment
6	System/subsystem model or prototype demonstration in a relevant environment
7	System prototype demonstration in an operational environment
8	Actual system completed and qualified through test and demonstration
9	Actual system proved through successful mission operations