This book presents the proceedings of the twelfth Building Bridges Seminar in Doha, Qatar in 2013, an annual gathering of Christian and Muslim scholars founded by the Archbishop of Canterbury. This volume is organized according to three major sub-themes: The Nature and Purpose of the Community, featuring essays by Gavin D'Costa on the Church and Abdullah Saeed on the Umma (nation or community); Unity and Disunity in the Life of the Community, featuring essays by Lucy Gardner and Feras Hamza; and Continuity and Change in the Life of the Community, feautring essays by Ahmet Alibasic and Brandon Gallaher. The final part of the book is a reflection by Lucinda Mosher on the spirit and tone of the exchanges between Christians and Muslims in Doha.