Column A

Spreadsheets that don't break when someone else opens them.

Most spreadsheet advice teaches you tricks. Column A teaches you structure — the small set of rules that decide whether a file still works six months from now, in someone else's hands, when you're on leave and can't be asked.

Short, silent, 30-second fixes you can watch on mute at your desk. One rule at a time.

Free Spreadsheet Health Check: columnahq.com