On the Stepwise and Disciplined Engineering ofAdaptive Service-Oriented ApplicationsH a b i l i t a t i o n s s c h r i f tZur Erlangung der Venia legendi fu¨r Informatik,angenommen durch die Fakult¨at fu¨r Informatikder Otto-von-Guericke-Universit¨at MagdeburgVon Dr. Ing. Nasreddine Aoumeurgeb. am 16 Ma¨rz 1964 in MascaraGutachterProf. Gunter Saake (Otto-von-Guericke-Universita¨t Magdeburg)Prof. Djamel Benslimane (Claude Bernard University, Lyon, France)Prof. Karsten Wolf (Universita¨t Rostock)Magdeburg, den 6.10.2010AcknowledgmentI am very grateful to Prof. Gunter Saake for offering me a scientific home all along this years. Thefruitful discussions within the Database group allowed me to significantly reshape and improve theoutput of this work. Therefore, many thanks to each member of the group. I am also thankfulto the dean of our faculty, for providing me with all requested resources to achieve this work inbest conditions. The presented research results have grow out from my postdoctoral stay at theUniversity of Leicester, within the European Agile project. Therefore, I express my gratitude toall members of the Project, and particularly Profs. Jose Fiadeiro and Martin Wirsing for theirconstructive conversations and advices. I am specially further grateful to Prof. Kamel Barkaoui,for the long-term and promising cooperation and the continuous support and encouragement. Myparticular thanks go also to the reviewers of this work.