RDA will be in two parts. As well as a general introduction, each part will also have a new introduction which will include background information and clear statements of the principles behind the rules, plus links to related standards and guidelines. Both parts I and II of AACR will now be included in part A of RDA. In very broad terms, part A will cover elements that libraries have traditionally recorded in bibliographic records, and part B will cover those traditionally recorded in authority records.