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Enigma Variations: Parsing the Riddle of Main Entry and the “Rule of Three” from AACR2 to RDA

ABSTRACT In the ten years since the International Conference on the Principles and Future Development of AACR, long-standing debates have continued as to whether or not to have a “main entry,” and whether or not to exercise the rule of three to limit the number of headings or access points in certain cases. Recent proposals from the Joint Steering Committee for Development of RDA have recommended a change in “main entry” terminology to “primary access point,” and the elimination of the rule of three. This article explores how and why these shifts have occurred.