Ordained ministry cannot be understood by itself or only in its relationship with Christ. It must find its identity in relationship to the Church, for it exists to serve and build up the Church. In Sacramental Orders Susan Wood places the theology of ordained ministry within its ecclesial foundations, identifying four concepts that shed light on different aspects of ordained ministry and its relationship to the Church: a monarchical and hierarchical concept; a eucharistic, collegial model of ministry representing the communion of particular Churches; the priest, prophet, and king, which structures the concept of the Church as the people of God; and a theology of the Church as a sacrament of Christ and ordained ministry as a sacrament of the Church.