Before revision: In integrated circuits, the stepping level or revision level is a version number that refers to the introduction or revision of the photolithographic photomask or masks within the set of plates that generate the pattern that produces an integrated circuit.
After revision: In integrated circuits, the stepping level or revision level is a version number that refers to the introduction or revision of one or more photolithographic photomasks within the set of photomasks that is used to pattern an integrated circuit.