Abstract. An approach to aspect-oriented change realization is proposed in this paper. With aspect-oriented programming changes can be treated explicitly and directly at the programming language level. Aspect-oriented change realizations are mainly based on aspect-oriented design patterns or themselves constitute pattern-like forms in connection to which domain independent change types can be identified. However, it is more convenient to plan changes in a domain specific manner. Domain specific change types can be seen as subtypes of generally applicable change types. This relationship can be maintained in a form of a catalog. Further changes can actually affect the existing aspect-oriented change realizations, which can be solved by adapting the existing change implementation or by implementing an aspect-oriented change realization of the existing change without having to modify its source code. Separating out the changes this way can lead to a kind of aspect-oriented refactoring beneficial to the application as such. As demonstrated partially by the approach evaluation, the problem of change interaction may be avoided to the large extent by using appropriate aspect-oriented development tools, but for a large number of changes, dependencies between them have to be tracked, which could be supported by feature modeling.

Abstract. It has been shown earlier that aspect-oriented change realization based on a two-level change type framework can be employed to deal with changes so they can be realized in a modular, pluggable, and reusable way. In this paper, this idea is extended towards enabling direct change manipulation using multiparadigm design with feature modeling. For this, generally applicable change types are considered to be (small-scale) paradigms and expressed by feature models. Feature models of the Method Substitution and Performing Action After Event change types are presented as examples. In this form, generally applicable change types enter an adapted process of the transformational analysis to determine their application by their instantiation over an application domain feature model. The application of the transformational analysis in identifying the details of change interaction is presented.

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