Amy Nelson Burnett offers a comprehensive analysis of the emergence of early Reformed theology and the construction of confessional identity within the Swiss Confederation from two complementary perspectives. In Part I, she focuses on the eucharistic controversy that fractured the evangelical movement in the mid-1520s and ultimately led to the institutional differentiation between Lutheran and Reformed traditions. The author explores not only the diverse positions in the debate over the Lord's Supper but also the underlying issues of interpretive authority, particularly the proper exegesis of Scripture and the reception of the church fathers. In Part II, she turns to the long-term consolidation of the Reformation in Basel, from the city's official renunciation of papal authority in 1529 to the ascendancy of Reformed Orthodoxy at the end of the century. By highlighting especially the theological and ecclesiastical contributions of Johannes Oecolampadius and Martin Bucer, Amy Nelson Burnett reveals the multifaceted nature of the early Reformed tradition and underscores the importance of developments occurring beyond the familiar centers of Zurich and Geneva.