Still a big difference between mission critical (money) and safety critical (lives). Safety critical encourages use of low variability languages, not just any

Still a big difference between mission critical (money) and safety critical (lives). Safety critical encourages use of low variability languages, not just any language will do. Also expects that software will fail at some point, so encourages architecture that is tolerant of this where the consequences warrant, eg redundancy and diversity such as 2oo3 voting a la airbus and space shuttle. So many other things, but it always annoys me when the "IT" guys get involved in the safety software engineering just because there is a PC used to program the device - they just don't get that there is no suitable attitude of "don't worry how or why it got lost, just send that email again". Tell that to the widow.