Perspectives on the World Christian Movement, provided by the U.S. Center for World Mission in cooperation with local churches, is a semester-long course offered in many cities across the U.S. and around the world. Also available online and in week-long intensives.
Two courses with similar content and purposes are Kairos and Pathways to Global Understanding.
Kingdom Expansion 101, provided by DualReach, is a six-session online intro-to-missions course designed with church mission leaders and volunteers in mind. You can work through it individually or with a group.
Other small group studies include: