From 2002-2008, three research groups from the departments of systematic theology and church history at the Faculty of Theology, K.U.Leuven, joined forces in an interdisciplinary project, entitled "Orthodoxy: Process and Product". The aim of the project was a "church-historical and systematic-theological study of the determination of truth in church and theology". The present volume contains contributions from all senior members of the project research group. The contributions are the result of a research conference in 2006, in which both the question of the nature of truth as such, and the process of determination of theological truth was approached from many different angles. Thus, questions from philosophy, systematic theology and history of church and theology are discussed, including such themes as the implications of various philosophical theories of truth for theology, the question of religious pluralism and its ramifications for theological truth-claims, theological truth claims in the thought of Gregory of Nyssa, Augustine, John Driedo, and at the Second Vatican Council.In addition, the meta-question of the relationship between the historical and the systematic aspects of theological truth and the way in which the historical and systematic theological disciplines interact play an important role in this volume.