Patrick O'Beirne of Systems Modelling Ltd sent me a list of articles about how not to use Excel. The first that I'll mention is his own The Devil's guide to spreadsheet creation, twenty rules for writing bad spreadsheets. Some will resonate with every programmer:
Don't obtain test data; whatever the spreadsheet result is, is right.and
Documentation is for wimps; specifications are for the timid.And, of course:
Just do it. Jump in and do it. The users will have to accept whatever you produce anyway.

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