Life-Changing Examples from the History of Israel Help your congregation experience the life-changing relevance of the Old Testament Old Testament Challenge (OTC) is a turn-key program to help everyone in your church understand and apply the Old Testament. Participants experience the content in multiple contexts: through sermons, group discussions, and personal devotions. This 32-week series is designed for churches to teach, study, and discuss the entire Old Testament over a 9-month period. The goal of OTC is to discover the life-changing truths of the Old Testament and how they can be applied to life today. Based on Pastor John Ortberg's OTC series at the New Community services at Willow Creek Community Church, this resource enables churches to raise the level of biblical literacy and understanding among their congregations. The OTC curriculum kit has 7-9 lessons. This second kit covers the historical books and includes everything you need to preach 7 sermons (that's less than $30 per week!).