The clearest scholarly references to Hyperdispensationalism (sometimes known as "Moderate Ultradispensationalism" and "Grace Believers") are made by Charles C. Ryrie and Charles F. Baker. Hyperdispensationalism as opposed to Ultradispensationalism and traditional (or mainstream) Dispensationalism, defines the beginning of "the church, which is His body" as beginning with the early ministry of the Apostle Paul in the book of the Acts of the Apostles, commencing between a specific New Testament timeline which is defined as being within The Acts of the Apostles chapters 9 to 15. It is this elementary doctrine that is central and pivotal to identifying the doctrine of Hyperdispensationalism.