> I discovered looking at these that there was an error in the spreadsheet double-counting all inputs (rows and columns were added and the row-totals included i

> I discovered looking at these that there was an error in the spreadsheet double-counting all inputs (rows and columns were added and the row-totals included in the grand total). Best I can tell, finding that bug was not in fact part of the course goal.... Multiple times I've come across issues like this when developing the replacement for an old access system. The numbers between the new an old system don't match, so you have to dig through both to find the error. If the error is in the new version that's great, but when you tell the boss that the error is in the old one and they've been off by a few million dollars over the years...