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The PRET working conferences are set up as a one-day event in such a way that it attracts an audience from both industry and academia. PRET 2010 was a continuation of the PRET 2009 working conference, which was organized as the industrial track at the 2009 CAiSE conference. The PRET 2010 working conference was organized as part of theenterpriseengineering week, and was co-located with PoEM 2010 and TEAR 2010 in Delft. The statement that modern-day enterprises are in a constant state of ?ux is in 2010 even more true than it was in 2009. The markets are in a state of confusion and seem to have no direction at all, as they are swinging back and forth depending on often contradictory signals and economic forecasts. As a consequence, enterprises, be they private businesses, government departments or other organizations, are taking their measures. Restructuring, divesting, - proving performance and merging are among the usual transformationactivities thatenterprisesconducttoprovideanswerstotheever-challengingdemandsthat are put on them. In addition to the tricky economic situation, developments like globalization, rapid technologicaladvancement, aging and the changing mindset of customers contribute to a situation in which nothing is certain anymore and in which change is the only constant. PRET approaches these developments and the impact they have on ent- prises from a holistic enterprise engineering perspective.

The PRET working conferences are set up as a one-day event in such a way that it attracts an audience from both industry and academia. PRET 2010 was a continuation of the PRET 2009 working conference, which was organized as the industrial track at the 2009 CAiSE conference. The PRET 2010 working conference was organized as part of theenterpriseengineering week, and was co-located with PoEM 2010 and TEAR 2010 in Delft. The statement that modern-day enterprises are in a constant state of ?ux is in 2010 even more true than it was in 2009. The markets are in a state of confusion and seem to have no direction at all, as they are swinging back and forth depending on often contradictory signals and economic forecasts. As a consequence, enterprises, be they private businesses, government departments or other organizations, are taking their measures. Restructuring, divesting, - proving performance and merging are among the usual transformationactivities thatenterprisesconducttoprovideanswerstotheever-challengingdemandsthat are put on them. In addition to the tricky economic situation, developments like globalization, rapid technologicaladvancement, aging and the changing mindset of customers contribute to a situation in which nothing is certain anymore and in which change is the only constant. PRET approaches these developments and the impact they have on ent- prises from a holistic enterprise engineering perspective.

This volume constitutes the proceedings of the Third IFIP WG 8.1 Working Conference on the Practice of Enterprise Modeling, held in Delft, The Netherlands, during November 9-10, 2010. The goal of the conference is both to foster a better understanding of the practice of enterprise modeling and to improve its theoretical foundations.The 17 papers presented were carefully reviewed and selected from 44 submissions. They reflect the trend for both practitioners and academics to look into domains and conceptualizations addressing dedicated business-oriented topics like business intelligence or domain-driven process families, and thus reach beyond traditional information systems engineering.

This volume constitutes the proceedings of the Third IFIP WG 8.1 Working Conference on the Practice of Enterprise Modeling, held in Delft, The Netherlands, during November 9-10, 2010. The goal of the conference is both to foster a better understanding of the practice of enterprise modeling and to improve its theoretical foundations.

The 17 papers presented were carefully reviewed and selected from 44 submissions. They reflect the trend for both practitioners and academics to look into domains and conceptualizations addressing dedicated business-oriented topics like business intelligence or domain-driven process families, and thus reach beyond traditional information systems engineering.

This volume constitutes the proceedings of the 5th International Workshop on Trends in Enterprise Architecture Research (TEAR), held in Delft, The Netherlands, on November 12, 2010. The main objective of the workshop is to identify major trends and challenges in enterprise architecture research by providing a discussion forum where researchers and practitioners can exchange experiences, problems, and ideas.The 7 papers presented were extensively reviewed and selected from 15 submissions. They report on core concepts and the effectiveness of enterprise architecture, on architecture description languages, and on exemplary case studies.