Because making software is like oneoff or small batch production as opposed to a traditional production line. Engineering practices vary wildly depending on wh

Because making software is like oneoff or small batch production as opposed to a traditional production line. Engineering practices vary wildly depending on what type of engineering you are doing. That's one of the problems they had when developing BS5750 and ISO9000 , "where do you hang the defect ticket" was one of the areas where they had problems - that was what the head of the BSI software quality project told me back when he was auditing a project I worked on ack in the 80's.