Richard P. Smiraglia has defined the meaning of ""a work"" empirically, and has revealed the ubiquitous phenomenon of instantiation among information objects. He is a member of the iSchool at UW Milwaukee’s Information Organization Research Group, author of the groundbreaking The Nature of ‘A Work’ (2001), and editor-in-chief of the journal Knowledge Organization. Pat Riva is Coordinator of the Monographs Section in the Cataloguing Directorate for Heritage Collections at Bibliothèque et Archives nationales du Québec in Montreal, Canada. Since 2005, she has been an elected member of the IFLA Cataloguing Section Standing Committee and chair of the FRBR Review Group. Maja Žumer is Professor of Information Science at University of Ljubljana, Slovenia. She is a member of the IFLA FRBR Review Group, Aggregates Working Group and FRBR/CRM Harmonisation Working Group. With her research group she is focusing on different aspects FRBR and has published extensively on these topics.