The only ones who considered engineering to be a exact science were the ones teaching it. We poor slobs who had to take that information and go out and earn a living soon found out the more often than not, the books lied or like economics--it the book didn't cover it---it suddenly became a "special case." It came home and bit deeply the first time the boss came down and said my parts weren't fitting together at an assembly plant building 60 cars an hour and what was I going to do about it. LIke an idiot, I fell back to schooling and said first we get data, analyize it , form a hypothesis and test it. Two hours later, I was on an airplane and later had additional pieces of my posterior chewed out by the plant manager. You can't go to school for that kind of training. It is also why I collected guns, it was cheaper than going to a shrink.