Working with a wide range of relevant sources the book contributes to the discussion of Philipp Melanchthon's profile as an academic and political agent, as a theologian and negotiator, particularly during the Diet of Augsburg 1530. The study provides a background for a historical reading and interpretation of the Augsburg Confession. "In addition to considerably enhancing our knowledge of Melanchton's work in a particularly decisive time of the Reformation, Andersen has also chosen a topic of undisputable systematic theological and ecumenical relevance." (Professor Knut Alfsvg, School of Mission and Theology, Stavanger, Norway)