[Drawing on the classical understanding of theology as faith seeking understanding, the author explores the structure of a systematic ecclesiology, arguing that such a theology must be empirical, critical, normative, dialectic, and practical. He further maintains that such a goal requires the critical engagement of the social sciences. His position is illustrated though an analysis of the emergence of structures of ministry in the early Church, viewed especially through 1 Clement and the letters of Ignatius of Antioch.]