This proceedings contains the contributions to the Workshop on Correctness of Model-based Software Composition, held in conjunction with the 17th European Conference on Object-Oriented Programming (ECOOP), Darmstadt, Germany on July 22, 2003. While most events concentrate on realisations of composition on the technological level this workshop aims at closing the gap of ensuring the intended composition result supported by the usage of models.

This proceedings contains the contributions to the Workshop on Model-Based Software Reuse, held in conjunction with the 16th European Conference Object-Oriented Programming (ECOOP) Malaga, Spain June 10, 2002. The workshop was motivated by the observation that convenient models are essential to understand the mechanisms of reuse. Models may help to define the interoperability between components, to detect feature interaction and to increase the traceability. They have the potential to define the essential aspects of the compositionality of the assets (i.e., components, aspects, views, etc.). 11 contributions give an overview about current research directions in the field of model-based software reuse.

This Technical Report collects all accepted contributions of the Workshop on Aspect-Oriented Software Development, held at Bonn (February 21-22, 2002). The Workshop web page may be found at URL: http://www.info.uni-karlsruhe.de/ pulvermu/workshops/aosd2002/ Modularisation as a means to achieve separation of concerns is a key concept in the development of complex software. A fundamental goal is the independent specification of system aspects and their subsequent integration. There have been several novel approaches which try to find new dimensions for separation of concerns beyond the "traditional" concepts of module and class. For examples of such "advanced separation of concerns" we cite Adaptive Programming, Aspect-Oriented Programming, Composition Filters, Hyperspaces, role modeling, Subject-Oriented Programming, and so on. Recently such approaches have been subsumed under the umbrella term Aspect-Oriented Software Development (AOSD), whose themes, in addition to programming language extensions, also encompass enhancements of traditional analysis and design methodologies. Such a new and emerging field has yet to garner a uniform conception of its scope and a definition of its central terms. After the success of the first workshop by the GI on this topic, and in the run-up to the 1st International Conference on Aspect-Oriented Software Development (April, 23-26, 2002), the aim of this workshop is again to provide room for fruitful discussions among various academic and industrial working groups who are involved with issues of aspect-oriented software development and related themes. We have accepted 11 papers for this year's workshop whose topics cover a broad range from theoretical reasoning about aspect-oriented systems to practical applications thereof. They are all included in this technical report.

This Technical Report collects all accepted contributions of the common Workshop of GI-FG 2.1.4 and GI-FG 2.1.9, held at Bad Honnef, Germany (May 2001). The workshop web page may be found at URL: http://www.informatik.uni-kiel.de/ wg/Honnef2001/Program.html

This Technical Report collects all accepted contributions of the Workshop on Feature Interaction, held at Budapest, Hungary on June 2001. The workshop web page may be found at URL: http://i44w3.info.uni-karlsruhe.de/˜pulvermu/workshops/ecoop2001/

This Technical Report collects all accepted contributions of the Workshop on Aspect-Oriented Programming, held at Paderborn (May 2001). The Workshop web page may be found at URL: http://i44w3.info.uni-karlsruhe.de/˜pulvermu/workshops/aop2001/