TRL 1 — Idea: basic principles are clear and not contradictory

TRL 2 —  The concept of technology is formulated

TRL 3 — The concept is confirmed by experiment, the list of materials is defined

TRL 4 — Technology tested in the laboratory, available laboratory prototype

TRL 5 — Alpha prototype. The first tests were performed

TRL 6 — Beta prototype. Technology demonstrated in the appropriate environment

TRL 7 — Demonstration of the prototype system in the working environment and at exhibitions

TRL 8 — Technology complete and qualified, available design documentation. Preparations are underway for serial production

TRL 9 — Setting up serial production and launching products on the market