So if you’re anything like me, you have a dangerous love for office supplies. You may not actually use them, but collecting them is just as good, right? Having a planner and page tabs and spiffy pens and whiteboards gives me the illusion of being a productive member of society even if I use exactly none of them on a daily basis.

BUT this month I want to talk about an office tool I am finally starting to make use of, and with great results: index cards. Specifically, colored ones employed for...