Documentary Hypothesis: Also known as the JEDP theory, the documentary hypothesis arose out of the work of nineteenth-century OT scholars K Graf and J. Wellhausen. They suggested that the Pentateuch (the first five books of the OT) was actually a compilation of the work of at least four separate sources, designated as the J (Jehovah) source, the E (Elohim) source, the D (Deuteronomist) source and the P (Priestly) source. The hypothesis stirred great controversy among conservative scholars who generally accepted Moses as the sole author of the Pentateuch.
 Stanley J. Grenz; David Guretzki; Cherith Fee Nordling. Pocket Dictionary of Theological Terms (Kindle Locations 420-423). Kindle Edition.