An organized set of interconnected subsystems and technical elements that accomplish an overall function.

A set of components that performs a specific function within a system.

A piece, part, or device within a subsystem that carries a primary technical function.

A novel or high-risk technology element that is critical to project success and should be assessed separately.

Paper studies, calculations, and documented analysis for the technology under development.

An integration of components used to determine concept feasibility, usually resembling the final system in function only.

An improved prototype after the breadboard that demonstrates stronger technical feasibility.

Performance interactions that occur when one technology element influences another in an integrated system.

The product-owning team that monitors technology development and TRA outputs.

Mechanical, thermal, data, electrical, magnetic, or other links that keep components physically and functionally connected.

A test setting that reproduces operational requirements or conditions for the final system.

A lab or controlled setting that simulates important and stressing operational aspects.

The intended environment with real operational requirements, platform constraints, packaging, and use conditions.

A prototype level that closely looks, behaves, or integrates like the final product.

A prototype level that illustrates basic function without final detail or realism.

Developmental Test and Evaluation, used to verify whether a system meets requirements.