Well, the Navy does have to make everything sailor-proof. To paraphrase my dad: "there's the right way, the wrong way and the Army [0] way." > Designing thing

Well, the Navy does have to make everything sailor-proof. To paraphrase my dad: "there's the right way, the wrong way and the Army [0] way." > Designing things that verify previous steps before acting on the next step is a great way to do it. In Japanese industry, this is called "poka yoke" [1]. It is very common in the auto industry (Toyota made it real popular). Notes: 0 - one could replace Army with Navy, Marines or Air Force with no loss of truthiness. 1 - https://en.wikipedia.org/wiki/Poka-yoke https://en.wikipedia.org/wiki/Poka-yoke