This study examines the changes and developments in three early Christian communities' expectations of Christ's return and the End of the World. Mark 13, Matthew 24 and 25 and Didache 16 are analyzed to find how early Christian expectations developed and how they were affected by the delay of Christ's return. The book questions the accepted models of change and offers new insights into the communities behind the Gospels of Mark and Matthew and behind the early Christian writing known as the Didache.