The Deuteronomist, or simply D, is one of the sources identified through source criticism as underlying much of the Hebrew Bible (Christian Old Testament). Seen by most scholars more as a school or movement than a single author, Deuteronomistic material is found in the book of Deuteronomy, in the books of Joshua, Judges, Samuel, and Kings (the Deuteronomistic history, or DtrH), and also in the book of Jeremiah. (The adjectives Deuteronomic and Deuteronomistic are sometimes used interchangeably: if they are distinguished, then the first refers to Deuteronomy and the second to the history.)