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Introduction 1
1. The Habit Zone 15 2. Trigger 39 3. Action 61 4. Variable Reward 95 5. Investment 135 6. What Are You Going to Do with This? 163 7. Case Study: The Bible App 179 8. Habit Testing and Where to Look for Habit-Forming Opportunities 193 acknowledgments 211 contributors 213 appendix 223 notes 225 |