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