The basis is a flexible methodology which is successfully used to develop start-ups and new products.
In the "flexible" methodology, after each iteration, a person observe the result and understand whether it meets the requirements or not. This is one of the advantages of a flexible model.
The methodology is suitable for a long life cycle of optics which constantly adapted to market conditions. Accordingly the optics requirements change in the process of improving.
zeiss
swarovskioptik
leica
nikonsportoptics
canon
bushnell
ricoh
kowaproducts
leupold
minox