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Düsseldorf, Germany

Hentrich C.,PricewaterhouseCoopers AG WPG | Zdun U.,University of Vienna
ACM International Conference Proceeding Series | Year: 2014

Many organizations still operate their business based on old legacy systems which cause high maintenance costs and are difficult to change. After the hype about service-oriented architectures (SOAs) was gone, they were implemented successfully and helped replacing old legacy systems with flexible services, for example at large companies in the finance or logistics industry. While recent research and the pattern literature cover the technical aspects of SOA and the alignment between business and IT, defining and planning a roadmap for a SOA modernization program, which is essential for initiating such a program and getting the necessary commitment, has not been in the focus of research yet. Thus, we propose a design process for the definition of a high-level roadmap. It considers determining architectural decisions and planning decisions by selecting appropriate patterns and reference architectures. Furthermore we define a heuristic for the roadmap planning activities, because we see a lack of appropriate planning patterns. A case study explains how the roadmap design process has been applied in a large-scale industry project concerning a SOA modernization program of a global logistics provider. The pattern-based process should motivate pursuing further research about roadmap design processes and patterns and provide guidance for industry experts. Copyright © 2014 ACM. Source

Frey F.J.,Vivaldistr. 6 | Hentrich C.,PricewaterhouseCoopers AG WPG | Zdun U.,University of Vienna
ACM International Conference Proceeding Series | Year: 2015

Moving from a heterogeneous IT landscape with a set of legacy applications to a more flexible SOA-based architecture is a major strategic concern for many large organizations. Key drivers are to build a robust, easy-to-maintain and cost-efficient architecture. Service identification is a key task in this context, and it must cope with the inherent complexity of existing IT systems and their constant evolution. In this paper we describe the CAPABILITY-BASED SERVICE pattern that identifies services and defines the service model based on a model of business capabilities. Business capabilities describe what an enterprise does, not how something is done in the enterprise. Service identification based on business capabilities is an alternative to process-based service identification, especially useful in cases where process modeling is not feasible, for instance, because of budget or time limitations or where processes are not stable enough over time. Copyright 2015 ACM. Source

Hentrich C.,PricewaterhouseCoopers AG WPG | Zdun U.,University of Vienna | Hlupic V.,University of Westminster | Dotsika F.,University of Westminster
ACM International Conference Proceeding Series | Year: 2015

Pattern mining is a term used in the pattern community to describe the process of identifying or discovering patterns. To identify new patterns, usually an informal or ad hoc process of finding patterns (e.g., in existing software systems) is used. This paper reflects on lessons learned and methods used regarding the integration of software pattern mining with qualitative research methods during our work on a pattern language for process-driven and service-oriented architectures (SOAs). This pattern language aims at closing the conceptual gap between business architecture and software architecture with a focus on process-driven solutions. In this paper we emphasize the notion of understanding patterns as sociological phenomena of problem solving behavior. We further introduce a systematic approach for pattern mining based Glaserian Grounded Theory techniques. This approach has been applied for mining the pattern language for process-driven SOAs. This work may also contribute to a better empirical grounding of software pattern mining. We will illustrate our approach using the pattern language for process-driven SOAs as a pattern mining case study. Copyright 2015 ACM. Source

Breisig V.,PricewaterhouseCoopers AG WPG | Otto H.,PricewaterhouseCoopers AG WPG | Schnelte A.,PricewaterhouseCoopers AG WPG | Tillner S.,PricewaterhouseCoopers AG WPG
GWF, Gas - Erdgas | Year: 2011

The political push to increase feedable biogas plants has been driven in the last two years by the amendment of the Gas Network Access Ordinance and the Renewable Energy Act 2009. Currently, a strong increase of these plants is reported. In contrast to the reports, the demand remains at a low level, so that a supply surplus exists. Especially the low natural gas price inhibits a switch of the existing gas-CHP to biomethane. Nevertheless, a switch to biomethane in many cases is worthwhile, not only for environmental but also for economic reasons. With an increase in the price of heating oil the price difference between natural gas and biomethane tends to decrease while the economic benefits of switching increase. Source

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