Notes in an Exam

I had my Chemistry Lab exam today, and we were interestingly allowed to use one 3x5 inch card of notes during the exam. Small writing is the name of the game, of course, but what was most helpful for me about this exercise was going through all we'd learned through the semester and considering what information is worth putting on the 3x5. Preparing the card could have been more useful than having it. Well played, professor.

On another note, if I were in a position of educational authority, I would like to try allowing a 1x1 inch card of notes in an exam just to see what happens.