I don't remember where I read this (and my summary might be off) but the computerized spreadsheet is a great invention because it's a programming environment fo

I don't remember where I read this (and my summary might be off) but the computerized spreadsheet is a great invention because it's a programming environment for non-programmers. "I need to input a number of variables and find their sum and average [or even more]. And I need to see how the outputs change if I change an input...".