Elder Robert D. Hales taught, "We need to know the official doctrine of the Church so we are not diverted from Christ's leadership." But how can we know what constitutes Church doctrine? That has been the driving question behind the research of Professor Michael Goodman of BYU's Church History and Doctrine department. In this podcast, he shares how church doctrine has been defined historically and highlights three specific criteria prophets, seers and revelators have consistently used to define it over the last four decades.