AACR2 : Descriptive Cataloguing for Monographs Introduction The purpose of this file is to be a very brief summary of key points from AACR2. I am covering monographs only at this time. Refer also to the memo: Standards, levels of cataloguing and AACR2 : Access Points. If required refer to the memo: Old rules: Pre-AACR2 cataloguing. A lot of judgement is required; the rules do not cover all cases.