Technology Readiness Level (TRL)

Technology Readiness Level (TRL) is a standardized nine-point maturity scale developed by NASA and adopted across DoD and civilian federal agencies to assess how mature a specific technology is, ranging from basic research principles (TRL 1) through successful operational deployment in real-world conditions (TRL 9).

What is Technology Readiness Level?

TRL was originally developed by NASA in the 1970s and formally adopted by DoD through DoDI 5000.02. The nine-level scale provides a consistent vocabulary for communicating technology maturity across programs, agencies, and contractors:

TRL 1 covers basic principles observed and reported. TRL 2 is technology concept and application formulated. TRL 3 is analytical and experimental critical function proof of concept. TRL 4 is component or breadboard validation in a laboratory environment. TRL 5 is component or breadboard validation in a relevant environment. TRL 6 is system or subsystem model prototype demonstration in a relevant environment. TRL 7 is system prototype demonstration in an operational environment. TRL 8 is actual system completed and qualified through test and demonstration. TRL 9 is the actual system proven through successful mission operations.

DoD acquisition policy requires Technology Readiness Assessments (TRAs) at Milestone B and Milestone C to verify that all critical technologies have achieved the minimum TRL required for the acquisition phase. Critical technologies must be at TRL 6 or above at Milestone B to be eligible for entry into the Engineering and Manufacturing Development phase. Technologies below TRL 6 at Milestone B represent a primary driver of cost and schedule growth on major defense programs.

Why TRL matters for government contractors

TRL is a direct factor in source selection evaluations for R&D and development programs. Contractors claiming higher TRL than their technology actually supports risk disqualification or contract termination when the government conducts an independent TRL assessment. Conversely, accurately demonstrating a TRL 6 or 7 technology provides a competitive advantage over competitors whose solutions require more development investment.

Example

A defense technology firm proposes a new infrared sensing array for a missile seeker. The firm claims TRL 5 in its proposal, supported by successful laboratory demonstrations in simulated target environments. After award, an independent Technology Readiness Assessment by a government lab reviews the firm's test data and concurs with TRL 5, noting that field demonstration in a tactically relevant environment will be required before TRL 6 is claimed. The program includes a technology maturation contract phase to achieve TRL 6 before Milestone B.

Frequently Asked Questions

Who assesses TRL on a government program?

TRLs are assessed by independent technical review teams, typically government scientists and engineers from program offices, labs (like Lincoln Laboratory, APL, or AFRL), or independent assessment organizations. The assessors review evidence packages that document the testing and analysis supporting each TRL claim. Contractor self-assessments are inputs, not the final determination.

Can a technology's TRL decrease?

Technically no, TRL represents the highest maturity level that has been successfully demonstrated. However, if the relevant environment changes (e.g., a new operational requirement that prior testing did not address), or if earlier testing is found to have been inadequately controlled, the technology may need to be re-demonstrated before the prior TRL can be credited.

What is the difference between TRL 5 and TRL 6?

TRL 5 requires validation in a "relevant environment", a simulated environment that approximates real-world conditions. TRL 6 requires demonstration of a prototype in the "relevant environment", the actual operational environment or a high-fidelity representation of it. For a space-based sensor, TRL 5 might involve thermal vacuum chamber testing; TRL 6 would require demonstration on a flight-like platform.

How does TRL relate to Manufacturing Readiness Level (MRL)?

TRL measures technology maturity; Manufacturing Readiness Level (MRL) measures manufacturing process maturity on an analogous 10-point scale. A technology can be at TRL 7 but only MRL 4 if the manufacturing processes to produce it at scale have not been developed. Both assessments are required for major defense programs at key milestones.