This document discusses gamification and how human psychology and game mechanics can be applied to encourage certain behaviors. It explains that humans are motivated by fame, happiness, community and competition. Games work by having players take actions within set rules to achieve goals while experiencing pressure and making choices. Common game mechanics that can motivate behaviors include status, achievement, lotteries, countdowns and avoidance. The benefits of gamification include viral adoption, sticky engagement, behavioral change and stable retention. Examples where gamification has been successfully applied include fitness trackers from Withings and Nike's FuelBand.