Kwak wonders if the very ease of use that Excel offers — allowing people with no programming
experience to knock together what are, in effect, relatively advanced applets — also makes it
dangerous to use in most sensitive situations. There's no debug, no audit trail, and no way to test
why a spreadsheet returns the value it does. Similarly, training for Excel, where it exists, tends
to ignore the importance of elegant and well-designed code, leading to legacy spreadsheets being
used with internal workings which are opaque to all but their original creator, who may have left
the company 20 years earlier.