A self-assessment guide for TRL (Technology Readiness Level) as relevant to sustainable software development projects.

Technology Readiness Levels (TRL) are a type of measurement system used to assess the maturity level of a particular technology. Each technology project is evaluated against the parameters for each technology level and is then assigned a TRL rating based on the project's progress. There are nine technology readiness levels. TRL 1 is the lowest and TRL 9 is the highest.

TRL scale was first developed by NASA. Since then, TRL has been adapted by diverse industries with a different spin to it. The assessment of TRL depends on the specific use cases and required threshold for the performance and cost of the technology.

Establishment of the right metrics to measure the TRL for any solution is important from performance and cost perspective. We had a hard time in our own self-assessment of TRL applying the NASA scale (specific to aeronautics), given that we were doing it for a sustainable software solution. Here’s how we sorted out the problem.

Self-Assessment Of TRL For Software

We found the following TRL guidelines helpful explicitly for software development published by GridLAB-D:

Principle (TRL 1)
The basic requirements of the principle are described and the class stub created.

Concept (TRL 2)
The basic design elements of the class are described and the variables enumerated in the class.

Proof (TRL 3)
The methodology to be used has been proven on paper or numerically in other environments.

Standalone (TRL 4)
The class has been implemented and passed standalone methodological and functional validation tests.

Integrated (TRL 5)
The class has been tested in conjunction with other classes and passed integrated methodological and functional validation tests.

Demonstrated (TRL 6)
The class has been shown to produce correct results in simple exemplary situations.

Prototype (TRL 7)
The class has been shown to produce correct results in complex exemplary situations.

Qualified (TRL 8)
The class has been shown to produce correct results in realistic situations.

Proven (TRL 9)
The class has been used successfully in production-grade analysis work.
Since our software solution designed with sustainability as a primary consideration, we found the following additional sustainability-based TRL assessment framework handy: