<p>As a matter of fact, I’ll give you a specific example. A few years back, I needed a calculation done. It involved stresses induced in CaF2 from temperature gradients. I had an ME do the calculation using some CAD program (I think) and it showed that if there was a temperature increase of 1degree C, that the material would effectively explode. This result is absurd. His stress calculations were off by 6 orders of magnitude. He didn’t understand the program and he didn’t understand roughly what result he should get. He was layed off within 6 months. You need to have a pretty good idea of what the result is going to be before you do the calculation so you know what to expect.</p>