I used to believe that Excel was a bad choice and that users should use a real modeling language. I've changed my mind. Excel is the only tool I've seen that

I used to believe that Excel was a bad choice and that users should use a real modeling language. I've changed my mind. Excel is the only tool I've seen that actually gets domain experts who aren't programmers to express their models in any kind of formal language. It deserves a lot more credit than it gets.