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
Synoptic Gospels of 1955. New attention is also being given to the Wilke hypothesis of 1838 which, like Farrer, dispenses with Q but ascribes the double tradition to Matthew's direct use of Luke. Meanwhile, the Augustinian hypothesis has also made a comeback, especially in American scholarship. The Jerusalem school hypothesis has also attracted fresh advocates, as has the Independence hypothesis, which denies documentary relationships altogether. On this collapse of consensus, Wenham observed: "I found myself in the Synoptic Problem Seminar of the Society for New Testament Studies, whose members were in disagreement over every aspect of the subject. When this international group