1. ULTIMATE SUN How can we use technology to convince ultimate frisbee players to apply sunscreen? JIMMY CHEN • REED MATHENY HABITS.STANFORD.EDU The question:

3. Monday afternoon practice without Ultimate Sun Everything goes fine until he realizes he’s gotten another sunburn, and tells himself that he’ll definitely remember sunscreen next time… Andrew packs his cleats and jersey a few minutes before practice, but does not apply sunscreen – it’s not a habit

4. Monday afternoon practice with Ultimate Sun Andrew is in a position to immediately act on the reminder – it’s a hot trigger . He applies sunscreen, goes to practice, and remains sunburn free 15 minutes before practice, Andrew receives an SMS with practice time, location, and sunscreen reminder

6. Results Applied sunscreen Didn’t attend Didn’t apply sunscreen Name Sunscreen without reminder? Friday, 4/23 Saturday, 4/24 Friday, 4/30 Monday, 5/3 John No Naveed Yes Ethan No Kellen No Sean Yes Andrew No Brandon No

7. What Went Wrong? Ability: Other players feel the need for sunscreen but don’t have their own bottles at home (Why didn’t you apply sunscreen?) “I don’t have any!” - Ethan Motivation: Some players just don’t care enough apply sunscreen; there’s little we can do for them. “I tan well.” - Sean Timing: the season had just ended and the only events were informal pickup games “ I only attended for part of the time.” - John

9. Looking Forward: ULTIMATE SUN 2011 * Leave No Player Behind: As part of the program, we will distribute bottles of sunscreen to every team member – nobody will be incapable of applying sunscreen Quick Start: We will launch right at the beginning of the 2011 season to make Ultimate Sun a team staple * Hypothetical