1. how do we get engineers to go outside more often? Alan Viverette habits.stanford.edu

2. what else are they doing in their free time? Alan Viverette habits.stanford.edu

3. Alan Viverette habits.stanford.edu

4. so why is it so popular and going outside isn’t? Alan Viverette habits.stanford.edu

5. step 1 forming the game playing habit (why the game is attractive) Alan Viverette habits.stanford.edu

6. visually attractive the first glimpse people have of the game is how it looks – and that is “pretty” Alan Viverette habits.stanford.edu

7. spreads virally when friends play, their friends play, and a single purchase can be used for multiple computers Alan Viverette habits.stanford.edu

8. people are already hooked builds on an already successful franchise with over 9.5 million copies sold since 1998 Alan Viverette habits.stanford.edu

9. step 2 strengthening the habit (why people play) Alan Viverette habits.stanford.edu

10. high availability the game lives on the computer desktop, which is where the player spends most of their time Alan Viverette habits.stanford.edu

11. predictable timing games are short, lasting ten to twenty minutes, and players can easily estimate how much time is left Alan Viverette habits.stanford.edu

12. competition the point of the game is to win, which equates to a randomly-scheduled operant conditioning reward Alan Viverette habits.stanford.edu

13. step 3 maintaining the habit (why people keep playing) Alan Viverette habits.stanford.edu

14. public ranking system since players compete within their bracket, the game’s difficulty level is never too high Alan Viverette habits.stanford.edu

15. tiered difficulty levels every time you play, you visibly increase your skill level and can play against better opponents Alan Viverette habits.stanford.edu

17. strengthen the habit by making it readily available, breakable into small and predictable time units, and making it competitive

18. maintain the habit by incentivizing it, let users increase rank or gain pointsAlan Viverette habits.stanford.edu