| 1. |
- Aier, Stephan, et al.
(författare)
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A Survival Analysis of Application Life Spans based on Enterprise Architecture Models
- 2009
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Ingår i: Proc. 3rd International Workshop on Enterprise Modelling and Information Systems Architectures, EMISA 2009. ; , s. 141-154
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Konferensbidrag (refereegranskat)abstract
- Modern enterprises face the challenge to survive in an ever changing environment. One commonly accepted means to address this challenge and further enhance survivability is enterprise architecture (EA) management, which provides a holistic model-based approach to business/IT alignment. Thereby, the decisions taken in the context of EA management are based on accurate documentation of IT systems and business processes. The maintenance of such documentation causes high investments for enter-prises, especially in the absence of information on the change rates of different systems and processes. In this paper we propose a method for gathering and analyzing such in-formation. The method is used to analyze the life spans of the application portfolio of three companies from different industry sectors. Based on the results of the three case studies implications and limitations of the method are discussed.
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| 2. |
- Buckl, S., et al.
(författare)
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A pattern-based approach to quantitative enterprise architecture analysis
- 2009
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Ingår i: 15th Americas Conference on Information Systems 2009, AMCIS 2009. - 9781615675814 ; , s. 2314-2324
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Konferensbidrag (refereegranskat)abstract
- Enterprise Architecture (EA) management involves tasks that substantially contribute to the operations of an enterprise, and to its sustainable market presence. One important aspect of this is the availability of services to customers. However, the increasing interconnectedness of systems with other systems and with business processes makes it difficult to get a clear view on change impacts and dependency structures. While management level decision makers need this information to make sound decisions, EA models often do not include quality attributes (such as availability), and very rarely provide quantitative means to assess them. We address these shortcomings by augmenting an information model for EA modeling with concepts from Probabilistic Relational Models, thus enabling quantitative analysis. A sample business case is evaluated as an example of the technique, showing how decision makers can benefit from information on availability impacts on enterprise business services.
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| 3. |
- Ekstedt, Mathias, et al.
(författare)
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A Tool for Enterprise Architecture Analysis of Maintainability : CSMR 2009, PROCEEDINGS
- 2009
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Ingår i: EUR CON SFTWR MTNCE REENGR. - Los Almitos : IEEE COMPUTER SOC. - 9780769535890 ; , s. 327-328
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Konferensbidrag (refereegranskat)abstract
- A tool for Enterprise Architecture analysis using a probabilistic mathematical framework is demonstrated. The Model-View-Controller tool architecture is outlined, before the use of the tool is considered. A sample abstract maintainability model is created, showing the dependence of system maintainability on documentation quality. developer expertise, etc. Finally, a concrete model of an ERP system is discussed.
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| 4. |
- Franke, Ulrik, et al.
(författare)
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A formal method for cost and accuracy trade-off analysis in software assessment measures
- 2009
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Ingår i: RCIS 2009. - NEW YORK : IEEE. - 9781424428649 ; , s. 295-302
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Konferensbidrag (refereegranskat)abstract
- Creating accurate models of information systems is an important but challenging task. It is generally well understood that such modeling encompasses general scientific issues, but the monetary aspects of the modeling of software systems are not equally well acknowledged. The present paper describes a method using Bayesian networks for optimizing modeling strategies, perceived as a trade-off between these two aspects. Using GeNIe, a graphical tool with the proper Bayesian algorithms implemented, decision support can thus be provided to the modeling process. Specifically, an informed trade-off can be made, based on the modeler's prior knowledge of the predictive power of certain models, combined with his projection of their costs. It is argued that this method might enhance modeling of large and complex software systems in two principal ways: Firstly, by enforcing rigor and making hidden assumptions explicit. Secondly, by enforcing cost awareness even in the early phases of modeling. The method should be used primarily when the choice of modeling can have great economic repercussions.
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| 5. |
- Franke, Ulrik, et al.
(författare)
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A Method for Choosing Software Assessment Measures using Bayesian Networks and Diagnosis : CSMR 2009, PROCEEDINGS
- 2009
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Ingår i: 13TH EUROPEAN CONFERENCE ON SOFTWARE MAINTENANCE AND REENGINEERING: CSMR 2009, PROCEEDINGS. - LOS ALAMITOS, CA. : IEEE COMPUTER SOC.. - 9780769535890 ; , s. 241-245
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Konferensbidrag (refereegranskat)abstract
- Creating accurate models of information systems is an important but challenging task. While the scienti c aspects of such modeling are generally acknowledged, the monetary aspects of the modeling of software systems are not. The present paper describes a Bayesian method for optimizing modeling strategies, perceived as a trade-off between these two aspects. Speci cally, an informed trade-off can be made, based on the modeler's prior knowledge of the predictive power of certain models, combined with her projection of the costs. It is argued that this method enhances modeling of large and complex software systems in two principal ways: Firstly, by enforcing rigor and making hidden assumptions explicit. Secondly, by enforcing cost awareness even in the early phases of modeling. The method should be used primarily when the choice of modeling can have great economic repercussions.
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| 6. |
- Franke, Ulrik, et al.
(författare)
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An Enterprise Architecture Framework for Application Consolidation in the Swedish Armed Forces
- 2009
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Ingår i: 2009 13TH ENTERPRISE DISTRIBUTED OBJECT COMPUTING CONFERENCE WORKSHOPS (EDOCW 2009). - NEW YORK : IEEE. - 9781424455638 ; , s. 264-273
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Konferensbidrag (refereegranskat)abstract
- In this paper, application consolidation using Enterprise Architecture methods is considered, with an ongoing project in the Swedish Armed Forces as the point of departure. The decision-making features of application consolidation are first analyzed and formalized from the perspective of decision theory. Applying these insights, a more practical framework is then proposed, based primarily on the ISO/IEC 9126 standard, the Ministry of Defence Architecture Framework (MODAF), and the formalism of Probabilistic Relational Models (PRM). This framework supports cost-benefit analysis of application consolidation decision-making, thus helping to make these decisions more structured and transparent.
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| 7. |
- Franke, Ulrik, et al.
(författare)
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Decision Support oriented Enterprise Architecture Metamodel Management using Classification Trees
- 2009
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Ingår i: 2009 13TH ENTERPRISE DISTRIBUTED OBJECT COMPUTING CONFERENCE WORKSHOPS (EDOCW 2009). - NEW YORK : IEEE. ; , s. 328-335
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Konferensbidrag (refereegranskat)abstract
- Models are an integral part of the discipline of Enterprise Architecture (EA). To stay relevant to management decision-making needs, the models need to be based upon suitable metamodels. These metamodels, in turn, need to be properly and continuously maintained. While there exists several methods for metamodel development and maintenance, these typically focus on internal metamodel qualities and metamodel engineering processes, rather than on the actual decision-making needs and their impact on the metamodels used. The present paper employs techniques from information theory and learning classification trees to propose a method for metamodel management based upon the value added by entities and attributes to the decision-making process. This allows for the removal of those metamodel parts that give the least "bang for the bucks" in terms of decision support. The method proposed is illustrated using real data from an ongoing research project on systems modifiability
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| 8. |
- Franke, Ulrik, et al.
(författare)
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Defense graphs and Enterprise Architecture for Information Assurance analysis
- 2008
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Ingår i: Proceedings of the 26th Army Science Conference.
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Konferensbidrag (refereegranskat)abstract
- The JQRR metrics for Information Assurance (IA)and Computer Network Defense (CND) are combinedwith a framework based on defense graphs. This enablesthe use of architectural models for rational decision making,based on the mathematical rigor of extended influencediagrams. A sample abstract model is provided,along with a simple example of its usage to assess accesscontrol vulnerability.
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| 9. |
- Franke, Ulrik, et al.
(författare)
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EAF(2) - A Framework for Categorizing Enterprise Architecture Frameworks
- 2009
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Ingår i: SNPD 2009. - LOS ALAMITOS : IEEE COMPUTER SOC. ; , s. 327-332
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Konferensbidrag (refereegranskat)abstract
- What constitutes an enterprise architecture framework is a contested subject. The contents of present enterprise architecture frameworks thus differ substantially. This paper aims to alleviate the confusion regarding which framework contains what by proposing a meta framework for enterprise architecture frameworks. By using this meta framework, decision makers are able to express their requirements on what their enterprise architecture framework must contain and also to evaluate whether the existing frameworks meets these requirements. An example classification of common EA frameworks illustrates the approach.
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| 10. |
- Franke, Ulrik, et al.
(författare)
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Enterprise Architecture analysis using Fault Trees and MODAF
- 2009
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Ingår i: Proceedings of the Forum at the CAiSE 2009 Conference. ; , s. 61-66
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Konferensbidrag (refereegranskat)abstract
- Analysis of dependencies between information systems, business processes, and strategic goals is an important part of the discipline of Enterprise Architecture (EA). However, EA models typically provide only visual and qualitative decision support. This paper shows how EA frameworks for dependency analysis can be extended into the realm of quantitative methods by the use of techniques from Fault Tree Analysis (FTA). Using MODAF, the UK Ministry of Defence Architecture Framework as an example, we give a list of criteria for the extraction of a metamodel for FTA use, and provide such a metamodel for MODAF. Furthermore, we use this MODAF FTA metamodel to perform dependency analysis on a sample MODAF model.
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