This book provides a basic theological and ethical framework within which Christians can responsibly reflect on issues such as cloning and the use of human stem cells for research and therapy. Although the issues relate directly to biomedical sciences and medicine, the principles delineated are relevant for evaluating other aspects of biotechnology. This book also invites the Church to engage with these important developments by helping her members understand the issues and concerns, and by being an active and responsible participant in public debates. It is written with the conviction that Christian views on these issues can enrich public understanding of their implications and contribute to the common good of society.