Want to join the global prayer movement? Operation World (OW), the definitive global prayer handbook, has been used by millions of Christians to pray for the nations. Now, with the mobile app, you can receive reminders to pray for the “country of the day,” discover information about every nation and engage with the praise reports and more in-depth prayer requests given for each country of the world. OW is widely regarded as the definitive volume of prayer information about the world and is the recipient of the ECPA Gold Medallion Award for Excellence in Evangelical Christian Literature. OW has had seven editions published along with several reprints. The original edition was produced in 1964, based from Southern Africa, and was only 32 pages of basic information about 30 countries. The most recent OW publication was an abridged version, called Pray for the World, which was released in late 2015. The app contains curated material from both of these resources along with selective updates. The various editions of OW and Pray for the World have been translated into several other languages: Arabic, Amharic, Chinese, French, German, Hindi, Indonesian, Italian, Korean, Portuguese, Russian, Spanish, and Urdu. The cumulative number of copies printed in all languages approaches 2.5 million. OW is listed in Christianity Today's “The Top 50 Books That Have Shaped Evangelicals: Landmark titles that changed the way we think, talk, witness, worship, and live.”