Discover effective A/B testing strategies from industry leaders at Duolingo, Dailymotion, and Monzo in this 28-minute conference talk from Google Play's Playtime 2019 event. Learn how to optimize your testing roadmap, avoid "spaghetti testing," and ensure actionable results. Explore key topics including operating principles, one-pager creation, data awareness, and real-world case studies. Gain insights from Vesna Doknic (Google Play), Jean-Loup Yu (Dailymotion), Karin Tsai (Duolingo), and Bruno Vaz Moço (Monzo) as they share their experiences and best practices for effective A/B testing in app development.