These user manuals make it easier for readers to use the editio critica maior of the Septuagint a a standard work unique in its kind a in an efficient way. They serve both as an introduction for beginners who use the GAttingen editions for the first time and as a tool designed for specialists to allow them to improve their work on this text. The complexity of the apparatus to the GAttingen Septuagint has longtime made readers wish for a higher level of auser friendliness'. Both volumes of the Benutzerhandbuch zur GAttinger Septuaginta fulfill this need. Now students, teachers and scholars in the fields of Old Testament and neighbouring disciplines are given the opportunity to work more efficiently with the editions of the Pentateuch and Ruth. The volumes provide a complete overview of the principles and apparatus employed in these editions as well as detailed information on the textual history of the Septuagint and its witnesses.