Constructive theology is the re-definition of what has historically been known as systematic theology. The reason for this reevaluation stems from the idea that, in systematic theology, the theologian attempts to develop a coherent theory running through the various doctrines within the tradition (Christology, eschatology, pneumatology, etc.). A potential problem underlying such study is that in constructing a system of theology, certain elements may be left out, or "forced" in order to maintain the coherence of the overall system.