Strategic Readiness Level
The ESA Science Technology Development Route
Instruments and spacecraft sub-systems are classified according to a "Technology Readiness Level" (TRL) on a scale of 1 to 9. Levels 1 to 4 relate to creative, innovative technologies before or during mission assessment phase. Levels 5 to 9 relate to existing technologies and to missions in definition phase.
ESA Technology Readiness Level Summary |
| TRL |
Level description |
| 1 |
Basic principles observed and reported |
| 2 |
Technology concept and/or application formulated |
| 3 |
Analytical & experimental critical function and/or characteristic proof-of-concept |
| 4 |
Component and/or breadboard validation in laboratory environment |
| 5 |
Component and/or breadboard validation in relevant environment |
| 6 |
System/subsystem model or prototype demonstration in a relevant environment (ground or space) |
| 7 |
System prototype demonstration in a space environment |
| 8 |
Actual system completed and "Flight qualified" through test and demonstration (ground or space) |
| 9 |
Actual system "Flight proven" through successful mission operations |
If the TRL is too low, then a mission risks being jeopardized by delays or cost over-runs. It is a responsibility of the Advanced Studies and Tedchnology Preparation Division to promote the technology readiness at a very early stage in order to make new missions feasible.
Last Update: 13 Feb 2012