Martin Assmann and Gregor Engels and Thomas von der Maßen and Andreas Wübbeke: Identifying Software Product Line Component Services. In Proceedings of International Conference on Evaluation of Novel Approaches to Software Engineering (ENASE 09). , pp. 45–56 (2009)
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@inproceedings{wuebb2009, author = {Martin Assmann and Gregor Engels and Thomas von der Maßen and Andreas Wübbeke}, title = {Identifying Software Product Line Component Services}, booktitle = {Proceedings of International Conference on Evaluation of Novel Approaches to Software Engineering (ENASE 09)}, year = {2009}, pages = {45–56} }

Software Product Line (SPL) development provides the possibility of reusing common parts in similar software products. However the SPL approach does not centrally improve the maintenance of software products of a Software Product Line. This paper presents an approach for reducing maintenance costs of SPL products by using the concept Software as a Service. The SPL-SaaS approach was developed with the experiences of arvato services integrating the software product line concept since years. It shows up the advantageous and disadvantageous characteristics of components that play a role for the concept combination. To be able to identify adequate components, criteria for the identification of software components suitable for the approach are derived from these characteristics. Furthermore the requirements of the potential service users are examined and categorized concerning their effects on the system architecture. Special requirements of customers often lead to architectural constraints that are not compatible with the approach. If both, the criteria are met and the architectural constraints are compatible, the SPL-SaaS approach can be applied to a component. The whole approach is applied on an example of arvato services

Martin Assmann and Markus Haack and Hendrik Scheider and Nico vom Hagen and Roger Zacharias: SOA-Business Case. In Transform IT: Optimale Geschäftsprozesse durch eine transformierende IT. Gabler (Wiesbaden, Deutschland), pp. 97--126 (2009)
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@inproceedings{Ass09, author = {Martin Assmann and Markus Haack and Hendrik Scheider and Nico vom Hagen and Roger Zacharias}, title = {SOA-Business Case}, booktitle = {Transform IT: Optimale Geschäftsprozesse durch eine transformierende IT}, year = {2009}, pages = {97--126}, address = {Wiesbaden, Deutschland}, publisher = {Gabler} }

Martin Assmann and Gregor Engels: Transition to Service-Oriented Enterprise Architecture. In Proceedings of the Second European Conference on Software Architecture (ECSA 2008), Paphos (Cyprus). Springer (Berlin/Heidelberg), LNCS, vol. 5292, pp. 346--349 (2008)
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@inproceedings{AssmannEcsa08, author = {Martin Assmann and Gregor Engels}, title = {Transition to Service-Oriented Enterprise Architecture}, booktitle = {Proceedings of the Second European Conference on Software Architecture (ECSA 2008), Paphos (Cyprus)}, year = {2008}, volume = {5292}, series = {LNCS}, pages = {346--349}, address = {Berlin/Heidelberg}, month = {September}, publisher = {Springer} }

Enterprise Architecture (EA) has undergone many changes since the IT has found its way into enterprises. At the moment the Service-Oriented Architecture (SOA) is being hyped but has also gained some importance. Implementing SOA can have many implications for an enterprise, depending on how visionary the implemented architecture is. This paper provides the description of an enterprise architecture that is fully-fledged concerning service-orientation and points out the architectural challenges that have to be mastered with future research results.

Martin Assmann and Gregor Engels: Service-Oriented Enterprise Architectures: Evolution of Concepts and Methods. In Proc. of the 12th IEEE International Enterprise Distributed Object Computing Conference 2008 (EDOC 08), Munich (Germany). IEEE Computer Society (Washington, DC, USA), pp. xxxiv--xliii (2008)
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@inproceedings{AssEDOC08, author = {Martin Assmann and Gregor Engels}, title = {Service-Oriented Enterprise Architectures: Evolution of Concepts and Methods}, booktitle = {Proc. of the 12th IEEE International Enterprise Distributed Object Computing Conference 2008 (EDOC 08), Munich (Germany)}, year = {2008}, pages = {xxxiv--xliii}, address = {Washington, DC, USA}, month = {September}, publisher = {IEEE Computer Society} }

This paper depicts the evolution of enterprise architectures to their today often used service-oriented form and presents a state-of-the-art development process for this kind of architecture. The development process covers both the development of business architecture as well as the appropriate software architecture. While showing up a possible form of further evolution of enterprise architectures, we identify the major challenges for future development methods of enterprise architectures.

Martin Assmann: Model-based evaluation of service-oriented enterprise architectures. Type: Phd Thesis (2009)
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@phdthesis{AssmannDiss09, author = {Martin Assmann}, title = {Model-based evaluation of service-oriented enterprise architectures}, year = {2009} }

Enterprise Architecture (EA) has undergone many changes since the IT has found its way into the world of enterprises. The introduction of Service-Oriented Architecture (SOA) is such a change with major consequences. The introduction of an SOA increases the flexibility and thus the productivity of an enterprise architecture, but unfortunately also its complexity. This makes the transformation of an enterprise architecture to an SOA-like enterprise architecture to a challenging and risky task. To overcome the change- and complexity-related problems when introducing SOA, Enterprise Architecture Management (EAM) systems are required. The approach of this thesis suggests a method on how to establish Enterprise Architecture Management that is especially suited for an SOA introduction. This thesis suggests a variant of an EAM system that is especially suited for the introduction of an SOA. The presented method on creating such an EAM system includes guidance on how to define a meta model for Service-Oriented Enterprise Architecture (SOEA), which is harmonized with the respective enterprise architecture. The SOA introduction is especially supported by defining SOA quality criteria and corresponding metrics. Some metrics have to be ascertained by experts. Other metrics have their measuring points within the SOEA models (instances of the SOEA meta model) and their calculation is automatable. Creating and maintaining SOEA models as well as applying the automatable metrics are supported by an eclipse-based tool. As metrics only produce measures that are hard to interpret, indicators are introduced. They allow interpreting the measures concerning the quality criteria. With the help of this EAM system, the transformation of an enterprise to a service-oriented enterprise can be planned and the level of goal-achievement (SOA-conformance of the EA) can be monitored steadily. By this, the contribution of this work aims at the reduction of the risk when introducing an SOA.