Synoptic Gospels texts of the three synoptic gospels often agree very closely in wording and order, both in quotations and in narration. Most scholars ascribe this to "documentary dependence", direct or indirect, meaning the close agreements among synoptic gospels are due to one gospel's drawing from the text of another, or from some written source that another gospel also drew from. The synoptic problem hinges on several interrelated points of controversy: Furthermore, some theories try to explain the relation of the synoptic gospels to John; to non-canonical gospels such as Thomas, Peter, and Egerton; to the Didache; and to lost documents such
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