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1 Gesellschaft für Informatik (GI) publishes this series in order to make available to a broad public recent findings in informatics (i.e. computer science and information systems), to document conferences that are organized in cooperation with GI and to publish the annual GI Award dissertation. Broken down into the fields of Seminar Proceedings Dissertations Thematics current topics are dealt with from the fields of research and development, teaching and further training in theory and practice. The Editorial Committee uses an intensive review process in order to ensure the high level of the contributions. The volumes are published in German or English. Information: ISSN ISBN This volume contains papers from the workshops of the Software Engineering 2009 conference held in Kaiserslautern from 2 to 6 March 2009.The topics covered in the papers range from requirements engineering, software architecture, model driven development, human computer interaction and visualization to reports discussing distributed development and enterprise architecture management technologies. Jürgen Münch, Peter Liggesmeyer (Hrsg.): Software Engineering GI-Edition Lecture Notes in Informatics Jürgen Münch, Peter Liggesmeyer (Hrsg.) Software Engineering Workshopband März 2009 Kaiserslautern Proceedings

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4 Jürgen Münch, Peter Liggesmeyer (Hrsg.) SoftwareEngineering 2009 Workshopband Fachtagungdes GI-Fachbereichs Softwaretechnik in Kaiserslautern Gesellschaft für Informatik e.v. (GI)

5 Lecture Notes in Informatics (LNI) -Proceedings Series of the Gesellschaft fürinformatik (GI) Volume P-150 ISBN ISSN Volume Editors Dr. Jürgen Münch Fraunhofer-InstitutfürExperimentelles Software Engineering Fraunhofer-Platz Kaiserslautern,Germany Prof.Dr.-Ing.Peter Liggesmeyer TU Kaiserslautern und Fraunhofer-Institut fürexperimentelles Software Engineering Fraunhofer-Platz Kaiserslautern,Germany Series Editorial Board Heinrich C. Mayr, Universität Klagenfurt, Austria (Chairman, Hinrich Bonin, Leuphana-UniversitätLüneburg,Germany Dieter Fellner, Technische Universität Darmstadt, Germany Ulrich Flegel, SAP Research, Germany Ulrich Frank,Universität Duisburg-Essen, Germany Johann-ChristophFreytag,Humboldt-UniversitätBerlin, Germany Ulrich Furbach, Universität Koblenz, Germany Michael Goedicke,Universität Duisburg-Essen Ralf Hofestädt, Universität Bielefeld Michael Koch, Universität derbundeswehr, München,Germany Axel Lehmann, Universitätder BundeswehrMünchen, Germany Ernst W. Mayr, TechnischeUniversität München,Germany Sigrid Schubert, Universität Siegen,Germany Martin Warnke, Leuphana-UniversitätLüneburg,Germany Dissertations DorotheaWagner, Universität Karlsruhe, Germany Seminars Reinhard Wilhelm, Universität dessaarlandes, Germany Thematics Andreas Oberweis, Universität Karlsruhe (TH) GesellschaftfürInformatik, Bonn 2009 printedbyköllen Druck+Verlag GmbH, Bonn

6 Vorwort Die Tagung Software Engineering 2009 (SE 2009) wurde vom 2. bis 6. März 2009 als fünfte Veranstaltung einer inzwischen etablierten Reihe von Fachtagungen durchgeführt, deren Ziel die Zusammenführung und Stärkung der deutschsprachigen Softwaretechnik ist. Die SE2009 bot ein Forum zum intensiven Austausch über praktische Erfahrungen, wissenschaftliche Erkenntnisse sowie zukünftige Herausforderungen bei der Entwicklung von Softwareprodukten bzw. software-intensiven Systemen. Sie richtete sich gleichermaßen an Teilnehmer aus Industrie undwissenschaft. Die Software-Engineering-Tagungsreihe wird vom Fachbereich Softwaretechnik der Gesellschaft für Informatik e.v. getragen. Die SE 2009 wurde vom Lehrstuhl Software Engineering: Dependability der Technischen Universität Kaiserslautern und dem Fraunhofer-Institut fürexperimentelles Software Engineering (IESE) veranstaltet. Ein wichtiger Bestandteilder SE 2009 waren achtworkshops zu innovativen und praxisrelevanten Themen imsoftware Engineering, die auf großes Interesse gestoßen sind. Die Workshops deckten thematisch den Software-Lebenszyklus vom Requirements Engineering und der Softwarearchitektur bis hin zu modernen modellgetriebenen Entwicklungsansätzen umfassend ab. Hinzu kamen Workshops zu innovativen Themen in den Bereichen Qualitätsmanagement, Human-Computer Interaction und Visualisierung, soziale Software, verteilte Entwicklung undenterprise Architecture Management. Der vorliegende Workshopband wurde im Anschluss an die Tagung erstellt, sodass Autoren die Möglichkeit hatten, Anregungen aus Diskussionen aus den Workshops aufzunehmen. Er umfasst alle Workshops mit Ausnahme des Workshops SQMB, der separate Proceedings vorlegt. Die Proceedings der Workshops SofTEAM und SENSE werden in diesem Workshopband unter dem Titel Social Aspects in Software Engineering zusammengeführt, da beide Workshops zusammen durchgeführtwurden. Unser Dank geht an die Organisatoren der einzelnen Workshops für ihr besonderes Engagement sowie an Henning Barthel, der die Zusammenstellung der Beiträge für diesen Band übernommen hat. Darüber hinaus danken wir dem Organisationsteam für die Unterstützungbei der Planung unddurchführungder Workshops. Wir wünschen Ihnen viele neue Einsichten und Erkenntnisse bei der Lektüre des vorliegenden Workshopbandes! Jürgen Münch, Leitung Workshopsund Tutorials Peter Liggesmeyer, Tagungsleitung Kaiserslautern, im April 2009

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8 Tagungsleitung Peter Liggesmeyer, TUKaiserslautern,Fraunhofer IESE Leitung Industrietag GregorEngels, UniversitätPaderborn Leitung Workshops und Tutorials Jürgen Münch, FraunhoferIESE Tagungsorganisation Jörg Dörr,FraunhoferIESE Norman Riegel, Fraunhofer IESE Simone Rockenmeyer, Fraunhofer IESE Programmkomitee KlausBeetz, Siemens AG Manfred Broy,Technische UniversitätMünchen Bernd Brügge,Technische UniversitätMünchen Jürgen Ebert, Universität Koblenz-Landau GregorEngels, UniversitätPaderborn Michael Goedicke,Universität Duisburg-Essen Klaus Grimm, Daimler AG VolkerGruhn,UniversitätLeipzig Wilhelm Hasselbring, Christian-Albrechts-Universität zu Kiel Lutz Heuser,SAP AG Stefan Jähnichen, Technische Universität Berlin Matthias Jarke, RWTH Aachen Udo Kelter, Universität Siegen Claus Lewerentz, Brandenburgische Technische UniversitätCottbus HorstLichter,RWTHAachen Oliver Mäckel, Siemens AG Florian Matthes, Technische UniversitätMünchen Manfred Nagl,RWTHAachen Barbara Paech,Universität Heidelberg KlausPohl, Universität Duisburg-Essen Ralf Reussner, Universität Karlsruhe (TH) Eric Sax, MBtech Group WilhelmSchäfer,UniversitätPaderborn AndySchürr, TechnischeUniversität Darmstadt Walter Tichy, Universität Karlsruhe (TH) Markus Voß,Capgeminisd&mAG MarioWinter, Fachhochschule Köln Andreas Zeller, Universität des Saarlandes HeinzZüllighoven, Universität Hamburg Albert Zündorf, Universität Kassel

9 Offizieller Veranstalter Fachbereich Softwaretechnikder Gesellschaft fürinformatik (GI) Mitveranstalter Fraunhofer-InstitutfürExperimentelles Software Engineering TechnischeUniversität Kaiserslautern Unterstützt wird die Tagung zudem von: Schweizer Informatik Gesellschaft (SI) Österreichische Computer Gesellschaft (OCG)

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12 Inhaltsverzeichnis Patterns in Enterprise Architecture Management (PEAM) Patterns in Enterprise Architecture Management (PEAM 2009) Florian Matthes, Alexander Ernst Some Process Patterns for Enterprise Architecture Management Christoph Moser, Stefan Junginger, Matthias Brückmann, Klaus-Manfred Schöne Enterprise Architecture Patterns for Multichannel Management Marc M. Lankhorst, Paul H.W.M. Oude Luttighuis An Enterprise Architecture Management Pattern for Software Change Project Cost Analysis Robert Lagerström, Pontus Johnson, David Höök Patterns for Enterprise-wide SOA Borjan Cace EA Management Patterns for Consolidations after Mergers Sabine Buckl, Alexander Ernst, Harald Kopper, Rolf Marliani, Florian Matthes, Peter Petschownik, Christian M. Schweda EA Management Patterns for Smart Networks Armin Lau, Thomas Fischer, Michael Weiß, Sabine Buckl, Alexander Ernst, Florian Matthes, Christian M. Schweda Produkt-Variabilität im gesamten Lebenszyklus (PVLZ) Produkt-Variabilität im gesamten Lebenszyklus (PVLZ2009) Klaus Marquardt, Dietmar Schütz, Markus Völter Ansatz für ein durchgängiges Variantenmanagement in der automobilen Steuergeräteentwicklung Christian Bimmermann Feature Dependencies have to be Managed Throughout the Whole Product Life-cycle Goetz Botterweck, Kwanwoo Lee Eine Infrastruktur für modellgetriebene hierarchische Produktlinien Christoph Elsner, Daniel Lohmann, Christa Schwanninger Modellgetriebenes Softwareengineering Der Beginn industrieller Softwareproduktion? Wolfgang Goerigk, Thomas Stahl

13 Variabilität als eine eigenständige Sicht auf Produktlinien Kim Lauenroth, Klaus Pohl Ein Klassifikationsansatz zur Variabilitätsmodellierung in E/E-Entwicklungsprozessen Cem Mengi, Ibrahim Armaç Architekturgetriebenes Pairwise-Testing für Software Produktlinien Sebastian Oster, Andy Schürr Konsistente Evolution von lebenszyklusübergreifenden Variabilitätsmodellen Klaus Schmid Human-Computer Interaction und Visualisierung Bedeutung und Anwendung im Software Engineering (HCIV) Human-Computer Interaction and Visualization (HCIV2009) Achim Ebert, Peter Dannenmann Novel Visual Representations for Software Metrics Using 3D and Animation Andreas Kerren, Ilir Jusufi The Role of Visualization in the Naturalization of Remote Software Immigrants Azam Khan, Justin Matejka, Steve Easterbrook Visual Debugger for Single-Point-Contact Haptic Rendering Christoph Fünfzig, Kerstin Müller, Gudrun Albrecht Applications of Visualization Technology in Robotics Software Development Max Reichardt, Lisa Wilhelm, Martin Proetzsch, Karsten Berns Network Situational Awareness: A Representative Study Thomas Eskridge, David Lecoutre, Matt Johnson, Jeffrey M. Bradshaw User Centered Design Patterns for Visualization Gerrit van der Veer, Elbert-Jan Hennipman, Evert-Jan Oppelaar Requirements Engineering und Business Process Management Konvergenz, Synonym oder doch so wie gehabt? (REBPM) Workshop Requirements Engineering und Business Process Management REBPM 2009 Daniel Lübke, Sebastian Adam, Sebastian Stein, Jörg Dörr, Kurt Schneider Einfluss dienstebasierter Architekturen auf das Requirements Engineering Anforderungen und Anwendungsfall Beate van Kempen, Frank Hogrebe, Wilfried Kruse

14 Requirements Engineering und Geschäftsprozessmodellierung zwei Seiten der gleichen Medaille Heinz Ehrsam, Ralf Fahney, Kurt McKeown Bridging Requirements Engineering and Business Process Management Ken Decreus, M. El Kharbili, Geert Poels, Elke Pulvermueller Qualität von Geschäftsprozessen und Unternehmenssoftware Eine Thesensammlung Barbara Paech, Andreas Oberweis, Ralf Reussner Verzahnung von Requirements Engineering und Geschäftsprozessdesign Matthias Weidlich, Alexander Grosskopf, Daniel Lübke, Kurt Schneider, Eric Knauss, Leif Singer Social Aspects in Software Engineering (SENSE, SofTEAM) Social Aspects in Software Engineering Anna Hannemann, Hans-Jörg Happel, Matthias Jarke, Ralf Klamma, Steffen Lohmann, Walid Maalej, Volker Wulf Supporting Software Development Teams with a Semantic Process- and Artifactoriented Collaboration Environment Sebastian Weber, Andreas Emrich, Jörg Broschart, Eric Ras, Özgür Ünalan Enabling Social Network Analysis in Distributed Collaborative Software Development Tommi Kramer, Tobias Hildenbrand, Thomas Acker Playful Cleverness revisited: open-source game development as a method for teaching software engineering Kaido Kikkas, Mart Laanpere Web 2.0 artifacts in SME-networks A qualitative approach towards an integrative conceptualization considering organizational and technical perspectives Nadine Blinn, Nadine Lindermann, Katrin Fäcks, Markus Nüttgens Investigating the Suitability of Web X.Y Features for Software Engineering Towards an Empirical Survey Eric Ras, Jörg Rech, Sebastian Weber A method for identifying unobvious requirements in globally distributed software projects Smita Ghaisas

15 A Web Platform for Social Requirements Engineering Steffen Lohmann, Sebastian Dietzold, Philipp Heim, Norman Heino Community Driven Elicitation of Requirements with Entertaining Social Software Anna Hannemann, Christian Hocken, Ralf Klamma Communication is the key Support Durable Knowledge Sharing in Software Engineering by Microblogging Wolfgang Reinhardt Improving Knowledge Sharing in Distributed Teams by Capturing and Recommending Informal Knowledge Hans-Jörg Happel, Walid Maalej Annals of Knowledge Sharing in Distributed Software Development Environments: Experience from Open Source Software Projects Sulayman K. Sowe, Rishab Ghosh, and Luc Soete Modellgetriebene Softwarearchitektur Evolution, Integration und Migration (MSEIM) Workshop Modellgetriebene Softwarearchitektur Evolution, Integration und Migration (MSEIM2009) Michael Goedicke, Maritta Heisel, Sascha Hunold, Stefan Kühne, Matthias Riebisch, Niels Streekmann Anwendung von grafischen Validierungsregeln bei der Entwicklung von IT- Integrationsprozessen Jens Drawehn, Sven Feja Berechnung von Modelldifferenzen als Basis für die Evolution von Prozessmodellen Stanley Hillner, Heiko Kern, Stefan Kühne Deriving Software Architectures from Problem Descriptions Denis Hatebur, Maritta Heisel Softwaremodernisierung durch werkzeugunterstütztes Verschieben von Codeblöcken Marvin Ferber, Sascha Hunold, Thomas Rauber, Björn Krellner, Thomas Reichel, Gudula Rünger

16 Patterns in Enterprise Architecture Management (PEAM)

17 Inhaltsverzeichnis Patterns in Enterprise Architecture Management (PEAM 2009) Florian Matthes, Alexander Ernst Some Process Patterns for Enterprise Architecture Management Christoph Moser, Stefan Junginger, Matthias Brückmann, Klaus-Manfred Schöne Enterprise Architecture Patterns for Multichannel Management Marc M. Lankhorst, Paul H.W.M. Oude Luttighuis An Enterprise Architecture Management Pattern for Software Change Project Cost Analysis Robert Lagerström, Pontus Johnson, David Höök Patterns for Enterprise-wide SOA Borjan Cace EA Management Patterns for Consolidations after Mergers Sabine Buckl, Alexander Ernst, Harald Kopper, Rolf Marliani, Florian Matthes, Peter Petschownik, Christian M. Schweda EA Management Patterns for Smart Networks Armin Lau, Thomas Fischer, Michael Weiß, Sabine Buckl, Alexander Ernst, Florian Matthes, Christian M. Schweda... 79

18 Patterns in Enterprise ArchitectureManagement (PEAM 2009) Florian Matthes,Alexander Ernst Technische Universität München There is a growing interest in academia and industry to identify, collect, document and exchange best practices in the management of very large software application landscapes in a structured manner. This workshop addresses European researchers and practitioners with experience in enterprise architecture management topics. The goal of the workshop is to improve this knowledge exchange by using an integrating pattern-based approach. An enterprise architecture management pattern (EAM pattern) is a general, reusable solution to a common problem in a given context which identifies driving forces, known usages and consequences. It can be specified on different levels of abstraction and detail, e.g. as a framework for enterprise architectures, as a method for enterprise modeling, or as a reference model. EAM patterns address social, technical and economic issues in a balanced manner. 17

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20 Some Process Patterns for EnterpriseArchitecture Management Christoph Moser 1,StefanJunginger 1,MatthiasBrückmann 2,Klaus-Manfred Schöne 2 1 BOCAG Wipplingerstraße 1 A-1010 Vienna 2 ZIVIT Wilhelm-Fay-Straße 11 D Frankfurt Abstract: The purpose of EAM patterns can be seen to supplement existing EAM frameworks, which often only provide generic approaches in implementing, maintaining, and analysing anenterprise Architecture. This is done by providing additional concepts, tailorable to the EAM problems at hand. This paper extends the existing EAM patterns approach of the Technical University of Munich by defining aconcept for EAM process patterns. Some EAM process patterns are presented indetail. 1. Introduction Numerous frameworks for EAM are discussed in literature (for an overview see for example [Sc06]). Some of them are extremely complex regarding the number of concepts they consider. On the other hand, practitioners stress that only pragmatic and not too complex EAM approaches lead to a successful implementation within an organisation [Ke07]. This conforms to the experiences of the authors of this paper two of us are with BOC, a company providing EAM solutions (ADOit, ADOben) and EAM consulting and two of us are enterprise architects at ZIVIT, one of the largest IT Service Providers in Germany's public administration. We see EAM patterns as a powerful tool for implementing EAM within an organisation, especially for enhancing efficiency with the purpose ofsaving money and time. In the following we use the concepts presented in the EAM pattern catalogue of the Technical University of Munich, Germany [Bu08]. An important feature of the tool (ADOit) we use is its metamodelling capability [BO08]. Most ADOit users define their own EAM metamodel. These metamodels are derived from their EAM objectives and usually consist of only a few concepts (in contrast to complex metamodels described in many EAM frameworks). 19

21 In [Bu08] methodology, viewpoint and information model patterns are distinguished. Methodology patterns are derived from so-called concerns. When implementing EAM (with ADOit) we use a similar approach which is depicted in figure 1. EAM Objectives Processes EAM Tool Metamodel Reports :interrelationship :isderived from Figure 1: Approach for implementingeam Starting from the EAM objectives we define within an EAM implementation project a) the metamodel (sometimes also called data model orinformation model), b)the needed reports and c) the processes for implementation, maintenance, and utilisation of the EA. The element "Metamodel" maps to the information model concept of[bu08], the element "Reports" maps tothe viewpoint concept 1 and the element Processes is part of the methodology patterns. The EAM objectives correspond approximately to the concern concept described in [Bu08]. However, we see EAM objectives on a higher level: We distinguish EAM objectives such as documentation of the application landscape, consolidation of the application landscape (e.g. by removing redundant applications or harmonising the application landscapes of different locations/countries), consolidation of hard- and software and SOA governance. Of course, these EAM objectives overlap (and so do the patternstoachieve them). An important element of EAM approaches not considered in detail within the methodology patternsof[bu08] isthe processes. 2 By "Processes" we mean the processes that define how EAM is done (not the business processes which are supported by IT). In our EAM implementation projects we experienced that there is a set of recurring "process patterns", e.g. different patterns how an EA repository can be built up and kept up-to-date, which roles shall be responsible for performing which tasks. It has to be noted, that some EAM frameworks (like TOGAF [TO06] and FEAF [CI99]) provide generic procedural models for implementing EAM. However, these procedural models can only be used as astarting point because of their highlevel of abstraction. In contrary, we see EAM processes on a much more detailed level. Akin to the support of service management processes in ITIL by a Configuration Management System (CMS) [OG07], EAM processes might be supported by an EAM tool (in this case, the EAM tool ellipse in figure 1needstobeextended). 1 Forabroaderdiscussion on theconcepts of concern, view and viewpoint referto[ai00] and[sc04]. 2 However, in [Er08] improvement potentialfor thecurrent version ofthe EAM pattern catalogueisdiscussed. It is outlined,thatbesides additionalimprovements, themethodology patterns willcontain more structured process descriptionsinthe upcoming version ofthe EAMpattern catalogue. 20

22 The remainder of the paper is organised as follows. In chapter 2 EAM processes are discussed, a definition of EAM process patterns is given and the pattern language we use to describe EAM process patterns is presented. Chapter 3 presents concrete EAM process patterns. The interplay and usage of these patterns is discussed, by integrating these with EA metamodels and EA reporting patterns. Finally, chapter 4 gives an outlook on future research fields. To illustrate the concepts presented in this paper we refer to the EAM implementation at ZIVIT. Details about this implementation can be found in[ju08]. 2. APattern Form foream Process Patterns There is not much literature about EAM processes (in comparison to publications about EAM modelling frameworks). Of course, the EAM processes needed depend on the EAM objectives. If, for example, the EAM objective is to standardise soft- and hardware a process is needed on how this standardisation should take place. Additionally, it has to be decided which processes are seen as part of EAM asitpossesses and ofcourse has to possess a tight integration with disciplines such as business process management, strategy management, (IT) service management, demand management, (project) portfolio management, requirements management, software development, risk and compliance management. Hence, some organisations see demand and portfolio management as part of EAM and others do not. To classify EAM process patterns concerning their utilisation within EAM processes, we use the high level EAM process landscape shown in figure 2. The process landscape is generic regarding EAM objectives and even abstracts from descriptions as they can be found for example in[de03], [TO06], [Ke07], [BO08],[Mo08]. Process 0: Develop/Update EAM Strategy (incl. Processes, Metamodel and Reports) Operational EAM / Operational Projects EAM / Operational Projects Projects Process 4: Monitor and Control Roadmap and Architecture Process 3: Define Roadmap and Project Portfolio Architecture Cycle Process 1: Document/Update and Evaluate Current Architectures Process 2: Develop Target Architectures Figure 2: High level generic EAM process landscape There is a separate research field dealing with process patterns. For example in the BPM/workflow area business process patterns are examined for many years [Aa03]. However, they usually focus on non-domain specific elements in business process models such as control structures. Therefore, the results from this research area do not fit 21

23 to our intention of EAM process patterns. In the software engineering community there are many publications about process patterns for the software development process [Co95]. Furthermore, concepts described in CMMI and ITIL can be seen as process patterns, too although not described this way [OG07], [CM06]. ITIL states for example, that the main purpose of its CMS is the provision of up-to-date and secure information via the configuration items used to support all service management disciplines [OG07]. Hence, there isamajor overlap with process patterns for keeping an EA repository up-to-date ("Process 1"in figure 2). The concepts developed in these fields fit better to our objectives just the application area is different (EAM vs. software development/it service management). We define an EAM process pattern as a "reusable element of an EAM process (model)". Usually, an EAM process pattern is parameterised in the sense that exact activities and roles executing the activities are defined whenapplying the pattern. We describe EAM processpatterns using the following "pattern form": Name: Concise, strong name for the pattern. Summary: Short description ofthe processpattern. EAM process: Description inwhich EAM process this pattern can be used. For this purpose we classify the patterns according to the process landscape shown in figure 2. Problem: Indication of the situation to which the pattern applies, and if applicable the entry conditions to performit. Solution: Description of the process pattern including the steps/activities to be performed. We use BPMN toillustrate the patterns. Resulting Context: Description of the situation/context which will result from performing the processpattern solution. Related Patterns: Indication ofpatterns that this pattern is composed of, isa part of, or is associated to. To describe the associations to metamodel (information model) and reports (viewpoints), we refer exemplarily to EAM patternsdescribed in [Bu08]. Known Uses/Examples: Description where/how the process pattern has been applied. 3. EAMProcess Patterns: Some Examples This chapter identifies an extensible set of reoccurring patterns in EA processes and shows the best use practices for them. The patterns are derived from the practical experience of the authors in EAM and literature. 22

24 3.1 Pattern: Centralised Manual Data Acquisition/Maintenance Summary: Architecture artefacts of a certain type (class) are maintained in the EA repository by acentral role, usually the enterprise architects. EAM Process: Process1. Problem: This process pattern can be applied if the EA repository shall be filled or updated. Solution: A small group, usually enterprise architects, is manually maintaining the EA repository. However, normally even insmall organisations the enterprise architects need input from experts of different domains. Depending on the used metamodel domain expertscould be business processexperts, application ownersand ICT experts. The tasks of this pattern are depicted infigure 3. If the architecture artefact is isolated it is simple to update the EArepository. However, usually architecture artefacts are strongly interrelated between each other. For example, an application and all interfaces offered by it usually build a logical entity. All artefacts of the logical entity need to be updated ideally within a small time span to avoid inconsistencies (like dangling interfaces when deleting an application). This reduces the time during whichthe EA repository is in anon-consistent state. Figure 3: Tasks ofthe EAM process pattern "Centralised Data Acquisition/Maintenance" Resulting Context: The EA repository is updated and in a consistent state. Data consistencyand alogical structure ofthe architecture artefacts are granted. Related Patterns: This pattern might be used in combination with the "release workflow pattern". The methodology pattern "Management of Homogeneity" (see [Bu08], M-21) is one example for using this pattern to catalogue the technologies within acentrally maintained structure. Known Uses/Examples: The pattern applies especially for those architecture artefact types, where the required know how for structuring is not widespread within the organisation or an overall structure needstobedeveloped first. 23

25 An example is the definition of a hierarchically structured process landscape, usually defined by a small team of business experts. Another example is described in [Ju08]. In this case software, technology and hardware artefacts are centrally maintained by the enterprise architects (see figure 4). The enterprise architects amongst other things are responsible for provision ofthe mentioned artefacts in anorganisation-wide agreed structure. Any application owner would use these artefacts for describing his application by assigning those architecture artefacts to his application. In the given scenario applications in contrast to technologies, hardware and software are maintained decentralised (see chapter 3.2). Decentral Application Owners maintain Applications Central use/based on Technology Software Hardware maintain Enterprise Architects Figure 4: Examplefor centralised anddecentralised maintenanceofanearepository 3.2 Pattern: Decentralised Manual Data Acquisition/Maintenance Summary: Partsofthe EA repository are manually maintained bydomainexperts. EAM Process: Process1. Problem: This process pattern is used for defining and maintaining architecture artefacts for which a central maintenance is not feasible. This applies especially to architecture artefacts where the needed knowledge for documenting and analysing is widespread within the organisation; e.g. alarge group of applicationowners. Solution: The domain expert updates the EA repository for architecture artefacts he is responsible for. If required, he requests architecture artefacts from other domain experts or from a central role (usually the enterprise architects). For example software or hardware artefacts might only be defined by enterprise architects or used interfaces might be defined byother applicationowners. The tasks are depicted infigure 5. To assure high quality of the contents of the EA repository changes to architecture artefacts should be stored in a change log. Within the change log it is recorded which changes have been done by whom and when. A more powerful way is to use the "release 24

26 workflow pattern" (see "Related Patterns"). Furthermore, the owners ofarchitecture artefacts should confirm the accurateness of their data on a regular basis, to demonstrate the accurateness to the possible users (this could of course be seen as a separate pattern). It has to be noted that this process pattern implies interesting requirements (intuitive GUI, accessrights, operation ofthe EAM tool etc.) to the EAM tool at hand. Figure 5: Tasks ofthe EAM process pattern "Decentralised Data Acquisition/Maintenance" Resulting Context: Adecentrally maintained architecture artefact is added orupdated. Related Patterns: This pattern might be used in combination with the "release workflow pattern". The methodology pattern "Management ofinterfaces" (see [Bu08], M-21) requires assigning interfaces to applications. Typically a multitude of applications and interfaces need to be recorded/maintained. If these need to be kept up-to-date within an EA repository, itisnearly impossible toachieve this by acentralised maintenance. Known Uses/Examples: Most organisations possess at least dozens of applications and there are usually hundreds of interfaces between them. Inthis case, adecentralised approach for maintaining the applications and belonging interfaces is preferable (see [Ju08] and figure 4). 3.3 Pattern: Automatic Data Acquisition/Maintenance Summary: This process pattern allows for keeping the EA and corresponding architecture models automatically up-to-date and consistent by importing models not controlled bythe EA architects. EAM Process: Process1 Problem: Often manual maintenance of the EAisnot feasible. Reasons might bethe low"willingness" of domain experts to provide the required data who are often forced to maintain multiple data sources, by providing nearly the same data, for example architectural models (like process architectures) which might not initially be developed to support the EAM initiative, but are valuable for EAM. 25

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