Some people are easy to gift. But then, there are those who are notoriously impossible to buy for. You know who they are. The friend that has everything, the sister who takes picky to a whole new level, or the mom who claims she doesn’t want anything at all (sure mom, sure). You can spend all year racking your brain for the perfect present to give them and still not come up with anything, which can make the holiday season more than a little stressful. But not this year. Because this year, we decided to lend our skills to the holiday shopping conundrum by putting together this very scientific chart to help you determine the best Function of Beauty gift to give literally everyone on your list. From your hair-obsessed BFF to the co-worker you got stuck with for Secret Santa, we have the perfect present for every person in your life, and this chart proves it. See for yourself below!