Some of the replies here validate my opinion that software development has an unnecessarily high opinion of itself. Software development is mostly a blue collar job which is ruined by those who think of it as a high science. Our industry would be a lot better off - and a lot better at what it does - if it embraced the blue collar nature of our work and educated and organised itself accordingly. Also, snobbery. The number of people who assumed that mechanics don’t do physics and then wrongly assume I meant programmers don’t do math…