Book excerpt: Missionaries must know God, be able to relate well to other people, understand and engage with another culture, and be able to use the Bible in a way that informs all aspects of their lives and ministries. Missionary training must address each of these areas if it is to help Christians to be effective in taking the gospel to the ends of the earth. Effective training has been shown to prevent people from prematurely leaving the field. It also reduces the danger of cross-cultural workers uncritically exporting culturally bound forms of Christianity. This book details four key areas that every missionary training program, whatever its context, must focus on developing. It shows how these can be holistically addressed in a learning community where trainers and trainees engage in cross-cultural ministry together.