The Conceptual Modeling Conference series is an annual forum for exploring research, development, novel applications and industrial innovations in the area of Conceptual Modeling. The 26th edition of this conference (ER 2007) will be held in Auckland (New Zealand) from 5 to 9 November 2007. Besides the main programme comprising accepted research papers and invited keynotes, tutorials, posters, industrial presentations and demonstrations, and several workshops on specific research topics in the area of Conceptual Modeling will be organised.