We are using Technology Readiness Level (TRL) to evaluate the maturity of each technology. It's defined close to NASA's TRL concept. The TRLs are scaled from 1 to 9, with 9 being the most mature technology.
Basic principles reported
Technology concept and/or application formulated
Critical function proof-of concept
Research work available
Research prototype validated
Prototype operated by professional users
Prototype operated by end-users
Actual product completed and validated by end-users
Actual product proven by massive end-users for daily basis
Most technologies in this list should fall into 4 or above.
