Nomenclature 3.0 is a much-expanded edition of Robert G. Chenhall's system for classifying man-made objects, originally published in 1978. The Chenhall system is the standard cataloging tool for thousands of museums and historical organizations across the United States and Canada. In this third edition, three new hierarchical levels of terms allow for more precise definitions of objects and their functions. Every classification and object term has been reviewed and revised as needed by a professional task force appointed by the American Association for State and Local History. AASLH has developed a free online community for all users and potential users of Nomenclature 3.0. Click here to access the Nomeclature 3.0 online community . Use this site to learn about Nomenclature 3.0, to share news and ask advice, and to submit your own proposals for additions and changes for future editions.