The consensus around the documentary hypothesis collapsed in the last decades of the 20th century.[5] The groundwork was laid with the investigation of the origins of the written sources in oral compositions, implying that the creators of J and E were collectors and editors and not authors and historians.[30] Rolf Rendtorff (1925–2014), building on this insight, argued that the basis of the Pentateuch lay in short, independent narratives, gradually formed into larger units and brought together in two editorial phases, the first Deuteronomic, the second Priestly.[31] This led to the current position which sees only two major sources in the Pentateuch, the Deuteronomist (confined to the Book of Deuteronomy) and the Priestly (confined to the books Genesis-Exodus-Leviticus-Numbers).[32]