The ACRL/RBMS Bibliographic Standards Committee (BSC) is engaged in a revision of Descriptive Cataloging of Rare Books. The new edition will be called Descriptive Cataloging of Rare Materials (Books), or DCRM(B). Related manuals for other formats under the DCRM umbrella are in process: DCRM(S), for rare serials and DCRM(M) for rare music. Descriptive Cataloging of Ancient, Medieval, Renaissance, and Early Modern Manuscripts (AMREMM) is now available from ACRL. Component rules for other formats of rare materials will be added as needed.