From ChristianityToday.com:

Kurt Ver Beek, assistant professor of sociology and third-world development at Calvin College in Grand Rapids, Michigan, published a study that questioned whether short-term missionaries and those served by such missionaries experienced long-term life changes from such missions. We summarized that study and asked Ver Beek to discuss his work further with Robert Priest, associate professor of mission and intercultural studies at Trinity Evangelical Divinity School in Deerfield, Illinois. At the end of the discussion, Ver Beek and Priest will take readers’ questions, which may be submitted via e-mail.