Oral gospel traditions called the M source for Matthew and the L source for Luke, which may have been a mix of written and oral material (see Two-source hypothesis). Most scholars believe that the author of John's gospel used oral and written sources different from those available to the Synoptic authors – a "signs" source, a "revelatory discourse" source, and others – although there are indications that a later editor of this gospel may have used Mark and Luke. Oral transmission may also be seen as a different approach to understanding the Synoptic Gospels in New Testament scholarship. Current theories attempt to link
Jerusalem School of Synoptic Research Bivin and Roy B. Blizzard Jr. which was reviewed by Michael L. Brown. The book itself is not published by the Jerusalem School, and only one of the co-authors is of the Jerusalem School. Yet, Brown not only questioned the work of individual school member David Bivin and co-author Roy Blizzard Jr., but by association also the Jerusalem School of Synoptic Research as a whole. Yet, even in his criticism of reconstructing a Hebrew Gospel (of which many Jerusalem School members are skeptical of as well), he affirms three significant points, which dovetail with the methodology—the three assumptions—of the Jerusalem