Markschies clears the ground by tracing how previous studies fail to appreciate the critical role that diverse Christian institutions played in creating and establishing the very theological ideas that later came to define them. He next examines three distinct forms of institutional life--the Christian institutions of (higher) learning, prophecy, and worship--and their respective contributions to Christianity's development. Markschies then focuses his attention on the development of the New Testament canon, demonstrating how different institutions developed their own respective "canons," while challenging views that assign a decisive role to Athanasius, Marcion, or the Gnostics. Markschies concludes by arguing that the complementary model of the "identity" and "plurality" of early Christianity is better equipped to address the question of unity and diversity than Walter Bauer's cultural Protestant model of "orthodoxy and heresy" or the Jesuit model of the "inculturation" of Christianity.