Technology readiness level
Technology readiness levels are a scale that measures how mature a technology is, from basic principles to proven operation.
Saying a technology is promising is easy. Saying precisely how mature it is, on a scale everyone shares, is more useful.
A technology readiness level is a point on a standardised scale that measures how mature a technology is, from the first observation of basic principles through to a system proven in real operation. Developed originally at NASA and now widely used, the scale gives a common vocabulary for how far a technology has actually progressed toward deployment.
A shared ladder of maturity
The value of the scale is that it replaces vague optimism with a defined rung. At the bottom sit basic principles and unproven concepts; in the middle, components validated in the laboratory and then in relevant environments; at the top, a complete system proven through successful operation in the real world. Everyone using the scale means the same thing by each level, which makes honest conversation about maturity possible.
Why it matters for decisions
Readiness levels support sober decisions about funding, risk, and timing. A technology at a low level may be exciting but is years and many uncertainties from use; one near the top is close to deployment but offers less room for breakthrough. Mixing the two up, treating a laboratory curiosity as if it were nearly ready, or dismissing a near-ready technology as still speculative, leads to bad bets. The scale forces clarity about how much development risk remains.
The limits of the ladder
The framework has blind spots. It measures technical maturity, not commercial viability; a technology can be fully proven yet have no market, or be manufacturable only at impossible cost. It also flattens the messy, non-linear reality of development into a tidy sequence. Readiness is necessary information, not sufficient.
Technology readiness levels are most useful as a discipline against wishful thinking, a way of asking, concretely, how far along a technology really is rather than how exciting it sounds. They answer the maturity question precisely, while leaving the equally important question of whether anyone will buy it to be asked separately.