 As a result, there has been a revival of interest in fragmentary and supplementary approaches, frequently in combination with each other and with a documentary model, making it difficult to classify contemporary theories as strictly one or another.Modern scholars generally see the completed Torah as a product of the time of the Persian Achaemenid Empire (probably 450–350 BCE), although some would place its production in the Hellenistic period (333–164 BCE), after the conquests of Alexander the Great.The Torah (or Pentateuch) is collectively the first five books of the Bible