The book "Ontologies-Based Business Integration" offers a comprehensive analysis and practical approaches to integrating business processes, applications, and information through the use of ontologies. The authors, Michael Rebstock, Fengel Janina, and Heiko Paulheim, combine their extensive experience from business practice with academic research to create a work that is significant for both scholars and practitioners. The book was developed as part of the Ontologies-based Reconciliation for Business Integration (ORBI) project, which was launched in 2004. It aims to address the challenges of e-business integration and provides valuable insights into the development and application of methods to enhance communication and understanding within companies. The combination of theoretical foundations and practical applications makes this book an essential guide for anyone involved in the integration of business processes.