Theological Triage and Theological Bias

Theological triage is basically a method for narrowing down the problem that we're facing or the issue that we see at hand. Is it a core doctrine or is it a secondary doctrine or practice? I love GK Chesterton's definition of orthodoxy. He said that orthodoxy is the creeds and the historic behavior of those who followed such a creed. We want to be reading from multiple perspectives and denominations because it offers such a robust understanding in our Christian faith.