This thesis has been written during my work as a team member of the Department of Databases and Information Systems (DBIS) at the University of Ulm. The motivation for working on the project "Schema Evolution in Process Management Systems" stems from the fundamental approaches on e.g., process design, dynamic process changes, and distributed process execution already conducted within the ADEPT project as well as from experiences with many practical projects.First of all, I thank my supervisor Prof. Dr. Peter Dadam for his guidance and support throughout my whole "thesis process". The fruitful discussions with him exceedingly contributed to make this thesis a success. Especially his enormous knowledge on related work and his problem-oriented view ("What's the message?") saved me from missing the red line. Finally, he always motivated me in being able to do anything I want.Furthermore, I thank Prof. Dr. Franz Schweiggert who accepted to act as second referee. His comments on my work and the discussion with him were very important for my work and motivating for me. Special thanks go to Dr. Manfred Reichert. The numerous discussion with him always helped me in proceeding with the content of my work. It was a pleasure to work with him on our diverse publications. His indefatigable effort to improve the quality of publications is admirable. I also thank him for proofreading my thesis.I also want to thank the whole DBIS team for helping and motivating me during my whole time at the department. The friendly and collaborative atmosphere largely contributed to feel happy during working hours. Finally thanks go to all students who contributed to this work (especially Markus Lauer for the implementation of the proof-of-concept prototype, the fruitful discussion, and the proofreading of the algorithms).My best thanks go to my parents Evi and Hermann Rinderle, my brother Matthias, my sister Julia, and my partner Oliver. Their love and support have made this work possible.