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Re: Non Professionals doing Engineering

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>Computers don't make mistakes, programmers and
>users do. You may be different, but I have found that I am not very
>good at checking my input for concept, accuracy, applicability, and typing.
An honest man. I've heard a lot of lectures about convergence checks and 
checking over source code, but the nastiest bites I've ever gotten were 
my own (usually) simple blunders. Like the punch press 
episode--everything looked great except my client thought the 
displacements didn't jibe with his measurements. Displacement and stress 
plots looked fine, equilibrium checked, but it turned out my elastic 
modulus was input as 3E6, I'd mixed up 30E6 and 3E7 when I entered them. 
Turned out to be no big deal--the client said the difference looked off 
by almost exactly 10, and all he really cared about were weld loads 
anyway, don't bother re-running. 

So I'd quibble with the 'Do the analysis and then it's over,' position. 
It's only begun when the numbers come out. That's the time you start 
asking all the questions you'd ask if your client presented you with 
results sent him by your competition.

Christopher Wright P.E.    |"They couldn't hit an elephant from
chrisw(--nospam--at)        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)