The document discusses the introduction of RDA (Resource Description and Access) in the context of library cataloging, highlighting significant changes in bibliographic records that will take effect at the Library of Congress on March 31, 2013. Key differences between AACR2 and RDA include the replacement of fields, the addition of new fields, and changes in cataloging practices such as the removal of abbreviations and the allowance for different case styles in titles. The document also references various resources and guidelines for understanding and implementing RDA in library systems.