| 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. |
- Buschle, Markus, 1983-
(författare)
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Tool Support for Enterprise Architecture Analysis : with application in cyber security
- 2014
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In today’s companies, business processes and information technology areinterwoven. Old and new systems as well as off-the-shelf products and tailoredsolutions are used. This results in heterogeneous, often complex ITlandscapes. The impact of changes and the affected systems are difficult toidentify. However, volatile business environments and changing customer requestsrequire organizations to adapt quickly and to frequently make decisionsabout the modifications of their information technology.IT management aims at generating value from the usage of informationtechnology. One frequently used IT management approach is Enterprise Architecture.Company-wide models are used to obtain a holistic picture. Thesemodels are usually created using Enterprise Architecture modeling tools.These tools frequently have strong documentation capabilities. However, theyoften lack advanced analysis functionality. Specifically, such tools do not offersufficient support for the analysis of system properties, such as cyber security,availability or interoperability. The ability to analyze a set of possible scenariosand predict the properties of the modeled systems would be valuablefor decision-making. Changes or extensions could be evaluated before theirimplementation. In other domains, for example, in architecture in its classicalmeaning or in the development of machines, the analysis of models is a commonpractice. Typically, CAD tools are used to perform analysis and supportdecision-making. It is thereby possible to investigate the stability of buildingsor the performance of engines without the need for empirical testing.The contribution of the research work documented in this thesis is a softwaretool with a particular focus on the analysis of Enterprise Architecturemodels and thereby support for decision-making. This tool combines stateof-the-art Enterprise Architecture tooling with advanced analysis capabilitiesthat, until now, were only offered by modeling tools for other domains. Thepresented tool possesses two components. One component allows the creationof a metamodel capturing Enterprise Architecture analysis theory, for example,relevant concepts in the context of cyber security and how they relateto each other. The other component supports the instantiation of the metamodelinto an Enterprise Architecture model. Once a model is in place, itcan be analyzed with regards to the previously specified theory so that, forinstance, a cyber security evaluation can be conducted.The analysis tool was partly developed within the context of a larger researchproject on cyber security analysis. However, the tool is not restrictedto applications within this field. It can be used for the evaluation of numeroussystem properties. Several authors contributed to the tool both on an implementationlevel and in the development and design of the tool’s features. Theperformed research followed the Design Science methodology. First, the objectivesof a tool for Enterprise Architecture analysis were defined. Next, anartifact was designed and developed in terms of a software tool. This tool wasthen demonstrated and evaluated against the objectives. Lastly, the resultswere communicated to both academic and non-academic audiences.
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| 3. |
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| 4. |
- Lagerström, Robert, et al.
(författare)
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Enterprise Meta Modeling Methods - Combining a Stakeholder-Oriented and a Causality-Based Approach
- 2009
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Ingår i: ENTERPRISE, BUSINESS-PROCESS AND INFORMATION SYSTEMS MODELING. - Berlin, Heidelberg : Springer Berlin Heidelberg. - 9783642018619 ; , s. 381-393
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Konferensbidrag (refereegranskat)abstract
- Meta models are the core of enterprise architecture, but still few methods are available for the creation of meta models tailored for specific purposes. This paper presents two approaches, one focusing on the stakeholders' information demand of enterprise architecture and the other driven by causal analysis of enterprise system properties. The two approaches are compared and a combined best-of-breed method is proposed. The combined method has merged the strengths of both approaches, thus combining the stakeholder concerns with causality-driven analysis. Practitioners will, when employing the proposed method, achieve a relevant meta model with strong, and goal-adapted, analytic capabilities.
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| 5. |
- Lagerström, Robert, 1981-, et al.
(författare)
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Visualizing and Measuring Enterprise Application Architecture : An Exploratory Telecom Case
- 2014
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Ingår i: 2014 47th Hawaii International Conference on System Sciences, HICSS. - : IEEE Computer Society. ; , s. 3847-3856
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Konferensbidrag (refereegranskat)abstract
- We test a method for visualizing and measuring enterprise application architectures. The method was designed and previously used to reveal the hidden internal architectural structure of software applications. The focus of this paper is to test if it can also uncover new facts about the applications and their relationships in an enterprise architecture, i.e., if the method can reveal the hidden external structure between software applications. Our test uses data from a large international telecom company. In total, we analyzed 103 applications and 243 dependencies. Results show that the enterprise application structure can be classified as a core-periphery architecture with a propagation cost of 25%, core size of 34%, and architecture flow through of 64%. These findings suggest that the method could be effective in uncovering the hidden structure of an enterprise application architecture.
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| 6. |
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