“TRLs are a set of management metrics that enable the assessment of the maturity of a particular technology and the consistent comparison of maturity between different types of technology—all in the context of a specific system, application and operational environment.” – TRL Handbook for space applications.

TRL – Technology Maturity Level

Levels 1 to 3


Level 4


Level 5


Level 6


Level 7


Level 8


Level 9