Which innovative product development approach was NOT used in the creation of the James Webb Space Telescope?

The James Webb Space Telescope represents one of the most ambitious product development projects in the history of astronomy. This engineering marvel required collaboration between NASA, ESA, and CSA, taking over two decades to develop with numerous technological innovations along the way. Test your knowledge about the development journey of this groundbreaking astronomical instrument that's revolutionizing our view of the universe.

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Cryogenic testing in vacuum chambers to simulate space conditions
Design of folding segments to fit the 6.5m mirror into a rocket
Use of rapid prototyping with 3D-printed mirror segments
Development of new gold coating techniques for infrared optimization