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  • 1. Aier, Stephan
    et al.
    Buckl, Sabine
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gleichauf, Bettina
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Schweda, Christian M.
    Ullberg, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    A Survival Analysis of Application Life Spans based on Enterprise Architecture Models2009Inngår i: Proc. 3rd International Workshop on Enterprise Modelling and Information Systems Architectures, EMISA 2009, 2009, Vol. P-152, s. 141-154Konferansepaper (Fagfellevurdert)
    Abstract [en]

    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.

  • 2.
    Ekstedt, Mathias
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närmen, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Setting the Information Systems Goals2007Inngår i: Enterprise Architecture: Models and Analyses for Information Systems Decision Making, Studentlitteratur, 2007, s. 92-152Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 3.
    Franke, Ulrik
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Holschke, O.
    Buschle, Markus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Rake-Revelant, J.
    IT consolidation - An optimization approach2010Inngår i: 2010 14th IEEE International Enterprise Distributed Object Computing Conference Workshops (EDOCW), IEEE , 2010, s. 21-26Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Consolidation of IT resources is a frequently cited task for IT decision makers, aiming to remove redundancy and thereby to cut costs. However, while economically motivated, the methods described in the literature rarely address costs directly. Instead, the focus often remains on purely IT-related considerations. In this paper, IT consolidation is addressed from an operations research perspective, applying a binary integer programming model to find optimal solutions to consolidation problems. Since accurate cost estimates are vital to successful consolidation, and play an important role in the presented binary integer program, the paper also addresses the costs involved in consolidation, with a particular focus on the costs of modifying business processes. Applying the mathematical method, with accurate cost estimates, enables decision makers to make optimal decisions in a transparent and rigorous way. The use of the proposed method is demonstrated with an example based on a real consolidation problem from a large European power supplier.

  • 4.
    Franke, Ulrik
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Höök, David
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ullberg, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gustafsson, Pia
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    EAF(2) - A Framework for Categorizing Enterprise Architecture Frameworks2009Inngår i: SNPD 2009: 10TH ACIS INTERNATIONAL CONFERENCE ON SOFTWARE ENGINEERING, ARTIFICIAL INTELLIGENCES, NETWORKING AND PARALLEL DISTRIBUTED COMPUTING, PROCEEDINGS, LOS ALAMITOS: IEEE COMPUTER SOC , 2009, s. 327-332Konferansepaper (Fagfellevurdert)
    Abstract [en]

    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.

  • 5.
    Gammelgård, Magnus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    A method for assessing the business value of information system scenarios with an estimated credibility of the result2010Inngår i: International Journal of Services Technology and Management, ISSN 1460-6720, E-ISSN 1741-525X, Vol. 13, nr 1-2, s. 105-133Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents a method for assessing the business value of information system scenarios. The purpose of the method is to provide information system decision makers with high quality information about potential future scenarios at a relative low cost of investigation. The method features three frameworks; one for functional assessments of information system scenarios, one for non-functional assessments of information system scenarios and finally a general business value taxonomy. The former two serve as an input structure to the latter one. The business various concepts in the business value taxonomy were prioritised by business managers to reflect the organisation's business needs. A problem with estimating the business value of an information system scenario is that it is a very complex undertaking; there are a vast number of aspects that need to be assessed in order to get a correct result. To be cost efficient all of these aspects cannot be addressed so the results of the method will inevitably contain a degree of uncertainty. The method thus also provides an estimate of the uncertainty of its results. The method has been tested in a comprehensive case study at a large European power company.

  • 6.
    Gammelgård, Magnus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Architecture scenario analysis - Estimating the credibility of the results2007Inngår i: 17th Annual International Symposium of the International Council on Systems Engineering, INCOSE 2007 - Systems Engineering: Key to Intelligent Enterprises, The International Council on Systems Engineering (INCOSE), 2007, s. 750-764Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Good decision support requires good information. A key aspect of good information is that it is credible. Presently, architecture frameworks and methods within systems engineering often lacks support for mediating the credibility of the analyses made. This paper presents a method for enterprise architecture analyses that employs an evidential reasoning algorithm for multi-attribute decision analysis. By doing this, the quality of the analyses as decision support is demonstrated. The method includes an assessment framework, based on established theories, for evaluating architecture scenarios functional and non-functional qualities. The paper also presents a full scale case study where method has been employed at a large European power company.

  • 7.
    Gammelgård, Magnus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Evaluation of business value of IT-system scenarios: a case study at a large north European power company2007Inngår i: PICMET '07: PORTLAND INTERNATIONAL CENTER FOR MANAGEMENT OF ENGINEERING AND TECHNOLOGY, 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents a method, the KTH1 IT Investment Evaluation Method, to assess the business value of IT-investments. The method aims at a priori and at a relative low cost of investigation assesses the business value of IT-systems scenarios, i.e. alternative combinations of IT-systems intended to support a particular business area. First, the scenarios are evaluated with respect to their technical quality. Second, the technical attributes used for this technical evaluation are related to business value dimensions, i.e. it is determined in what ways certain functions and non-functional attributes generate business value. Third, the business value dimensions are prioritized by the business managers. Finally, the business value of each scenario is established by combining the technical assessments with the relations to the business value dimension found in the second step and the prioritizations done by business managers. All parts of the method have been verified in comprehensive case study at a large European power company and the results are presented in the paper.

  • 8.
    Gammelgård, Magnus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES).
    Ekstedt, Mathias
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES).
    Business Value Evaluation of IT Systems: Developing a Functional Reference Mode2006Inngår i: Proceedings of the the Fourth Conference on Systems Engineering, 2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In this paper an approach to develop and refine a functional reference model for IT-systems is presented. Such reference models form a fundament on which to evaluate the business value of IT systems. The approach involves scrutinizing the functional reference model with respect to correctness, completeness, granularity and measurability. In the particular case of this study, the functional reference model represents systems functionality needed to support asset management processes in industries such as electric energy production and distribution. It is based on the IEC 61968 standard and its Interface Reference Model, IRM, which has been refined in the process described in the paper. The refinement included a comprehensive field study, interviewing experts in the field of asset management at a large European energy company, as well as vendors of asset management systems.A general method for evaluating IT investment scenarios is outlined in the paper and the refined functional reference model is an important component in this method. Creation of this IT evaluation method is an ongoing research project, where the functional reference model forms a central part. The purpose of the IT investment evaluation method is to give decision makers a tool to evaluate potential investment scenarios with respect to the value the investment would generate to the business. The first part of the method consists of evaluating the technical quality of the system scenarios. Technical quality is divided into functional and non-functional attributes, where the functional reference model is used for the functional assessment. The second part of method consists of establishing the business value based on the evaluation of the technical qualities. This paper thus focuses on the first part, and in particular the development of the functional reference model which is a central piece in the IT investment evaluation method.

  • 9.
    Gunaratne, Dinusha
    et al.
    Vattenfall Research and Development AB.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    A Framework to Evaluate a Functional Reference Model at a Nordic Distribution Utility2008Inngår i: NORDAC 2008, The 8th Nordic Electricity Distribution and Asset Management Conference. Bergen, Norway. 8-9 September 2008, 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Distribution utilities have found IT systems to be indispensable for competition in the deregulated electricity market. But in order to be highly efficient, a distribution utility ought to essentially maintain a correlation between IT systems and business processes. A Functional Reference Models (FRM) is one way to achieve this correlation.A FRM is a versatile and multidisciplinary tool that could be used to create alignment between business processes and IT-systems by describing what a “business is” and in terms of business functions that are carried out. There are many utility standards and system vendors claiming to offer complete FRMs for the utility domains. In addition, of course there exist implicit FRMs in the company in terms of existing processes and IT-systems. Thus there is a growing need among distribution utilities for a method to evaluate the quality and suitability of a FRM for a given enterprise.This paper will describe the development of a framework that has been used to evaluate the quality of a FRM in a Nordic distribution utility by benchmarking against the IEC 61968-1, UCA 2.0, IFS and Oracle FRMs for the utility domain. The framework cross reference a FRM with other FRMs to get a Coverage of all the business functions used in the utility business and eliminate vendor dependence and it analyze the strengths and weakness of the FRM and what amendments to be included. Finally it evaluates the Suitability of the FRM to the utility by aligning with the IT systems. The evaluation also helps to identify redundant IT systems and maximize the IT usage in a distribution utility. This paper concludes with a motivation to distribution utilities to adopt a FRM discussing its business values.

  • 10. Holschke, Oliver
    et al.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Rocha Flores, Waldo
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ericsson, Evelina
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Schönherr, Marten
    Using Enterprise Architecture Models and Bayesian Belief Networks for Failure Impact Analysis2010Inngår i: Journal of Enterprise Architecture, ISSN 2166-6768, Vol. 6, nr 2Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The increasing complexity of enterprise information systems makes it very difficult to prevent local failures from causing ripple effects with serious repercussions to other systems. This article proposes the use of Enterprise Architecture models coupled with Bayesian Belief Networks to facilitate Failure Impact Analysis. By extending the Enterprise Architecture models with the Bayesian Belief Networks we are able to show not only the architectural components and their interconnections but also the causal influence the availabilities of the architectural elements have on each other. Furthermore, by using the Diagnosis algorithm implemented in the Bayesian Belief Network tool GeNIe, we are able to use the network as a Decision Support System and rank architectural components with their respect to criticality for the functioning of a business process. An example featuring a car rental agency demonstrates the approach.

  • 11. Holscke, Oliver
    et al.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Rocha Flores, Waldo
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Eriksson, Evelina
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Schönherr, Marten
    Using Enterprise Architecture Models and Bayesian Belief Networks for Failure Impact Analysis2009Inngår i: Lecture Notes in Computer Science: Service-Oriented Computing, 2009, s. 339-350Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The increasing complexity of enterprise information systems makes it very difficult to prevent local failures from causing ripple effects with serious repercussions to other systems. This paper proposes the use of Enterprise Architecture models coupled with Bayesian Belief Networks to facilitate Failure Impact Analysis. By extending the Enterprise Architecture models with the Bayesian Belief Networks we are able to show not only the architectural components and their interconnections but also the causal influence the availabilities of the architectural elements have on each other. Furthermore, by using the Diagnosis algorithm implemented in the Bayesian Belief Network tool GeNIe, we are able to use the network as a Decision Support System and rank architectural components with their respect to criticality for the functioning of a business process. An example featuring a car rental agency demonstrates the approach.

  • 12.
    Johnson, Pontus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gustafsson, Pia
    Selecting Enterprise Architecture Models2007Inngår i: Enterprise Architecture: Models and Analyses for Information Systems Decision Making, Studentlitteratur, 2007, s. 213-239Kapittel i bok, del av antologi (Annet vitenskapelig)
  • 13.
    Johnson, Pontus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Simonsson, Marten
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise architecture analysis with extended influence diagrams2007Inngår i: Information Systems Frontiers, ISSN 1387-3326, E-ISSN 1572-9419, Vol. 9, nr 2-3, s. 163-180Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The discipline of enterprise architecture advocates the use of models to support decision-making on enterprise-wide information system issues. In order to provide such support, enterprise architecture models should be amenable to analyses of various properties, as e.g. the level of enterprise information security. This paper proposes the use of a formal language to support such analysis. Such a language needs to be able to represent causal relations between, and definitions of, various concepts as well as uncertainty with respect to both concepts and relations. To support decision making properly, the language must also allow the representation of goals and decision alternatives. This paper evaluates a number of languages with respect to these requirements, and selects influence diagrams for further consideration. The influence diagrams are then extended to fully satisfy the requirements. The syntax and semantics of the extended influence diagrams are detailed in the paper, and their use is demonstrated in an example.

  • 14.
    Johnson, Pontus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Simonsson, Mårten
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Extended influence diagrams for enterprise architecture analysis2006Inngår i: 10th IEEE International Enterprise Distributed Object Computing Conference, Proceedings, 2006, s. 3-12Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The discipline of enterprise architecture advocates the use of models to support decision-making on enterprise-wide information system issues. In order to provide such support, enterprise architecture models should be amenable to analyses of various properties, as e.g. the level of enterprise information security. This paper proposes the use of a formal language to support such analysis. Such a language needs to be able to represent causal relations between, and definitions of, various concepts as well as uncertainty with respect to both concepts and relations. To support decision-making properly, the language must also allow the representation of goals and decision alternatives. This paper evaluates a number of languages with respect to these requirements, and selects influence diagrams for further consideration. The influence diagrams are then extended to fully satisfy the requirements. The syntax and semantics of the extended influence diagrams are detailed in the paper, and their use is demonstrated in an example.

  • 15.
    Johnson, Pontus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Simonsson, Mårten
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Extended Influence Diagrams for System Quality Analysis2007Inngår i: Journal of Software, ISSN 1796-217X, Vol. 2, nr 3, s. 30-42Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Making major changes in enterprise information systems, such as large IT-investments, often have a significant impact on business operations. Moreover, when deliberating which IT-changes to make, the consequences of choosing a certain scenario may be difficult to grasp. One way to ascertain the quality of IT investment decisions is through the use of methods from decision theory. This paper proposes the use of one such method to facilitate IT-investment decision making, viz. extended influence diagrams. An extended influence diagram is a tool able to completely describe and analyse a decision situation. The applicability of extended influence diagrams is demonstrated at the end of the paper by using an extended influence diagram in combination with the ISO/IEC 9126 software quality characteristics and metrics as means to assist a decision maker in a decision regarding an IT-investment.

  • 16.
    Johnson, Pontus
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Simonsson, Mårten
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    System Quality Analysis with Extended Influence Diagrams2007Inngår i: CSMR 2007 Workshop and Special Session papers, 2007Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Making major changes in enterprise information systems, such as large IT-investments, often have a significant impact on business operations. Moreover, when deliberating which IT-changes to make, the consequences of choosing a certain scenario may be difficult to grasp. One way to ascertain the quality of IT-investment decisions is through the use of methods from decision theory. This paper proposes the use of one such method to facilitate IT-investment decision making, viz. extended influence diagrams. An extended influence diagram is a tool able to completely desccribe and analyse a decision situation. The applicability of extended influence diagrams is demonstrated at the end of the paper by using an extended influence diagram in combination with the ISO/IEC 9126 software quality metrics as means to assist a decision maker in a decision regarding an IT-investment.

  • 17.
    König, Johan
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    An extended framework for reliability analysis of ICT for power systems2011Inngår i: 2011 IEEE PES Trondheim PowerTech: The Power of Technology for a Sustainable Society, POWERTECH 2011, IEEE , 2011, s. 6019343-Konferansepaper (Fagfellevurdert)
    Abstract [en]

    This paper presents an extended probabilistic framework for reliability analysis of Information and Communication Technology (ICT) for power systems. The framework is based on Probabilistic Relational Models (PRMs) and includes the analysis of both primary equipment and the supporting ICT systems. The framework also separates between the functional structure and the physical infrastructure. To be able to analyze architectural properties, such as redundancy, the framework is extended with logical gates which are based on AND and OR logic. The gates serve and important purpose when integrating the framework into an analysis tool that supports PRMs. The problem without logical gates is the dynamic sizing of the conditional probability tables which depend on the number of parent nodes. This problem is solved by using aggregation functions. The application of the extended framework is demonstrated by applying to an example system-architecture with two types of redundant configurations.

  • 18.
    Lagerström, Robert
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Extended influence diagram generation2007Inngår i: Enterprise Interoperability II: New Challenges and Approaches, GODALMING: SPRINGER-VERLAG LONDON LTD , 2007, s. 599-602Konferansepaper (Fagfellevurdert)
  • 19.
    Nordstrom, Lars
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Modelling and evaluating non-functional aspects of integrated protection and control systems2008Inngår i: Int. Conf. Large High Voltage Electr. Syst., CIGRE, 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The later years of development within information and communication technologies (ICT) have enabled power system control to make greater use of new types of sensors, communication systems, and distributed computer platforms. Traditionally centralized SCADA/EMS solutions with local protection systems are merging into integrated protection and control systems utilizing for example wide area measurements. In such control system architectures, functionality needed for control and protection of the power system can be located at any platform within the distributed ICT platform. An example of this development is the use of autonomous systems and intelligent agents for power system control and operation. Another development is loosely coupled system architectures built on Service Oriented Architectures. Although these ICT based control technologies appear to offer possibilities of improved power system operation and control, they of course cannot be implemented if the overall security and safety requirements on the power system cannot be met. An obvious concern to raise regarding implementation of such systems for power system control and operation is the non-functional aspects of the systems in terms of their performance, dependability, interoperability and level of information security and how these effect the stability and safety of the power system. To address this challenge, we present a framework for modeling and evaluation of integrated protection and control systems that includes a wide range of non-functional aspects and offers support for decision making in design of such systems. The method is based on modeling concepts developed within the area of Enterprise Architecture and the use of a formalism termed Extended Influence Diagrams (EID). The EIDs are used to represent the relation between the attributes that constitute the non-functional aspects in question. The factors represented in the EIDs are all theoretically grounded and empirically established within the research community. The representation of the factors in EIDs further allows the evaluation of their inter-dependence using Bayesian logic. Based on the factors and their relation as described in the EID, modeling semantics for control system components that include these attributes are defined. By creating models of the intended system using these semantics, an engineer can evaluate the effect on the non-functional aspects under study from the design decisions taken.

  • 20.
    Nordström, Lars
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gammelgård, Magnus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    A Functional Reference Model For Asset Management Applications Based on IEC 61968-12006Inngår i: Proceedings of Nordic Distribution and Asset Management Conference, 2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Distribution utilities that upgrade or implement new asset management applications very soon arrive at a stage where the business value of different system options needs to be assessed and compared One obvious, aspect that must be considered in the respective options is their functional fit, i.e. the degree to which their functionality suits the business needs of the utility. At the same time it is inherently difficult to objectively measure the functional fit of a proposed system solution. One way to evaluate the functional fit is to develop a functional reference model and then compare the functionality of the proposed system, or systems with the reference model. In order for the reference model to be of any value it needs to be based on business requirements rather than existing system functionality and it needs to be complete in the sense that it encompasses all possible functions in the evaluated functional area. This paper desccribes the development of a reference model for asset management applications in the area of electricity distribution and generation. The functional reference model is based on an existing functional breakdown presented in the IEC-61968 standard developed for interapplication integration at electrical utilities. Also incorporated into the model are functions from various vendors of asset management applications. Having merged these sources together, the model has been validated by means of an extensive case study at a large Nordic power company.

  • 21.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Buschle, Markus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    An enterprise architecture framework for multi-attribute information systems analysis2014Inngår i: Journal of Software and Systems Modeling (online), ISSN 1619-1366, E-ISSN 1619-1374, Vol. 13, nr 3, s. 1085-1116Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Enterprise architecture is a model-based IT and business management discipline. Enterprise architecture analysis concerns using enterprise architecture models for analysis of selected properties to provide decision support. This paper presents a framework based on the ArchiMate metamodel for the assessment of four properties, viz., application usage, system availability, service response time and data accuracy. The framework integrates four existing metamodels into one and implements these in a tool for enterprise architecture analysis. The paper presents the overall metamodel and four viewpoints, one for each property. The underlying theory and formalization of the four viewpoints is presented. In addition to the tool implementation, a running example as well as guidelines for usage makes the viewpoints easily applicable.

  • 22.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Buschle, Markus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Hybrid Probabilistic Relational Models for System Quality Analysis2010Inngår i: Proceedings - IEEE International Enterprise Distributed Object Computing Workshop, EDOC, KTH Royal Institute of Technology, 2010, s. 57-66Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The formalism Probabilistic Relational Models (PRM) couples discrete Bayesian Networks with a modeling formalism similar to UML class diagrams and has been used for architecture analysis previously. PRMs are well-suited to perform architecture analysis with respect to system qualities since they support both modeling and analysis at the same time. A particular strength of PRMs is the ability to perform meaningful analysis of domains where there is a high level of uncertainty, as is often the case when performing system quality analysis. However, the use of discrete Bayesian networks in PRMs complicates the analysis of continuous phenomena. The main contribution of this paper is the Hybrid Probabilistic Relational Models (HPRM) formalism which extends PRMs to enable continuous analysis thus extending the applicability for architecture analysis and especially for trade-off analysis of system qualities. HPRMs use hybrid Bayesian networks which allow combinations of discrete and continuous variables. In addition to presenting the HPRM formalism, the paper contains an example which details the use of HPRMs for architecture trade-off analysis.

  • 23.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Buschle, Markus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture Availability Analysis Using Fault Trees and Stakeholder Interviews2014Inngår i: Enterprise Information Systems, ISSN 1751-7575, E-ISSN 1751-7583, Vol. 8, nr 1, s. 1-25Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The availability of enterprise information systems is a key concern for many organisations. This article describes a method for availability analysis based on Fault Tree Analysis and constructs from the ArchiMate enterprise architecture (EA) language. To test the quality of the method, several case-studies within the banking and electrical utility industries were performed. Input data were collected through stakeholder interviews. The results from the case studies were compared with availability of log data to determine the accuracy of the method's predictions. In the five cases where accurate log data were available, the yearly downtime estimates were within eight hours from the actual downtimes. The cost of performing the analysis was low; no case study required more than 20 man-hours of work, making the method ideal for practitioners with an interest in obtaining rapid availability estimates of their enterprise information systems.

  • 24.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Assessing the quality of service of Powel's netbas at a nordic utility2009Inngår i: IET Conference Publications, Prague, 2009, nr 550 CPKonferansepaper (Fagfellevurdert)
    Abstract [en]

    The power industry's overall need to become more efficient affects all parts of their business. With respect to asset management and workforce management business processes this is becoming increasingly apparent. One of the critical success factors of high process quality are high quality Information and Communication Technology (ICT) solutions. This paper proposes a method to assess the quality of ICT solutions for asset and workforce management applications within the power industry. The method has validated the method through an empirical case study at a Nordic utility.

  • 25.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Assessing the quality of service of Powel's netbas at a nordic utility2008Rapport (Annet vitenskapelig)
  • 26.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Holm, Hannes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Honeth, Nicholas
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Using enterprise architecture analysis and interview data to estimate service response time2013Inngår i: Journal of strategic information systems, ISSN 0963-8687, E-ISSN 1873-1198, Vol. 22, nr 1, s. 70-85Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Insights into service response time is important for service-oriented architectures and service management. However, directly measuring the service response time is not always feasible or can be very costly. This paper extends an analytical modeling method which uses enterprise architecture modeling to support the analysis. The extensions consist of (i) a formalization using the Hybrid Probabilistic Relational Model formalism, (ii) an implementation in an analysis tool for enterprise architecture and (iii) a data collection approach using expert assessments collected via interviews and questionnaires. The accuracy and cost effectiveness of the method was tested empirically by comparing it with direct performance measurements of five services of a geographical information system at a Swedish utility company. The tests indicate that the proposed method can be a viable option for rapid service response time estimates when a moderate accuracy within 15% is sufficient.

  • 27.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Holm, Hannes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Höök, David
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Honeth, Nicholas
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Using enterprise architecture and technology adoption models to predict application usage2012Inngår i: Journal of Systems and Software, ISSN 0164-1212, E-ISSN 1873-1228, Vol. 85, nr 8, s. 1953-1967Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Application usage is an important parameter to consider in application portfolio management. This paper presents an enterprise architecture analysis framework which can be used to assess application usage. The framework, in the form of an architecture metamodel, incorporates variables from the previously published Technology Acceptance Model (TAM) and the Task-Technology Fit (TTF) model. The paper describes how the metamodel has been tailored for a specific domain, viz, industry maintenance management. The metamodel was tested in the maintenance management domain through a survey with 55 respondents at five companies. Data collected in the survey showed that the domain-specific metamodel is able to explain variations in maintenance management application usage. Integrating the TAM and TTF variables with an architecture metamodel allows architects to reuse research results smoothly, thereby aiding them in producing good application portfolio decision-support.

  • 28.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Holm, Hannes
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Data accuracy assessment using enterprise architecture2011Inngår i: Enterprise Information Systems, ISSN 1751-7575, E-ISSN 1751-7583, Vol. 5, nr 1, s. 37-58Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Errors in business processes result in poor data accuracy. This article proposes an architecture analysis method which utilises ArchiMate and the Probabilistic Relational Model formalism to model and analyse data accuracy. Since the resources available for architecture analysis are usually quite scarce, the method advocates interviews as the primary data collection technique. A case study demonstrates that the method yields correct data accuracy estimates and is more resource-efficient than a competing sampling-based data accuracy estimation method.

  • 29.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    König, Johan
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture Analysis for Data Accuracy Assessments2009Inngår i: 2009 IEEE INTERNATIONAL ENTERPRISE DISTRIBUTED OBJECT COMPUTING CONFERENCE, Los Alamitos, CA: IEEE COMPUTER SOC , 2009, s. 24-33Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Poor data in information systems impede the quality of decision-making in many modern organizations. Manual business process activities and application services are never executed flawlessly which results in steadily deteriorating data accuracy, the further away from the source the data gets, the poorer its accuracy becomes. This paper proposes an architecture analysis method based on Bayesian Networks to assess data accuracy deterioration in a quantitative manner. The method is model-based and uses the ArchiMate language to model business processes and the way in which data objects are transformed by various operations. A case study at a Swedish utility demonstrates the approach.

  • 30.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Lagerström, Robert
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Franke, Ulrik
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Data Collection Prioritization for System Quality Analysis2009Inngår i: Electronic Notes in Theoretical Computer Science, 2009, Vol. 233, nr C, s. 29-42Konferansepaper (Fagfellevurdert)
    Abstract [en]

    When assessing software quality the cost of collecting the data needed for analysis is often quite substantial. This paper proposes the use of Bayesian networks for assessing software qualities combined with an algorithm for how to prioritize which data to collect in order to minimize the cost of the assessment. This algorithm, the Diagnosis algorithm, is implemented in the Bayesian network tool 'GeNIe'. An example evaluation of service interoperability in the paper demonstrates that using the algorithm may reduce time spent on data collection significantly.

  • 31.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture: A framework supporting system quality analysis2007Inngår i: 11TH IEEE INTERNATIONAL ENTERPRISE DISTRIBUTED OBJECT COMPUTING CONFERENCE, PROCEEDINGS, LOS ALAMITOS: IEEE COMPUTER SOC , 2007, s. 130-141Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Enterprise Architecture is a model-based approach to business-oriented IT management. To promote good IT decision making, an enterprise architecture framework needs to explicate what kind of analyses it supports. Since creating enterprise architecture models is expensive and without intrinsic value, it is desirable to only create enterprise architecture models based on metamodels that support well-defined analyses. This paper suggests a metamodel derived specifically with a set of theory-based system quality analyses in mind The ISO 91 26-bused theory behind the system quality analysis is introduced in the shape of an extended influence diagram. Finally an example illustrates that our theory-based metamodel does support system quality analysis.

  • 32. Närman, Per
    et al.
    Nordström, Lars
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Gammelgård, Magnus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Validation and refinement of an asset management subset of the IEC 61968 Interface Reference Model2006Inngår i: 2006 IEEE/PES Power Systems Conference and Exposition. Vols 1-5, NEW YORK: IEEE , 2006, s. 915-922Konferansepaper (Fagfellevurdert)
    Abstract [en]

    the IEC 61968 standard is being developed to facilitate integration of applications related to distribution management, i.e. the management of power distribution networks. As an important baseline the standard contains an Interface Reference Model (IRM). IRM contains functions that define the scope of distribution management. This paper presents a study that was conducted regarding the use of the IRM as a base for evaluating functionality of commercial asset management solutions. The subset of the IRM related to asset management was studied, and based on this subset a refined reference model was created. In addition to the IRM-subset, the refined functional reference model also incorporated functions present in actual asset management solutions. The model was also validated and refined by means of an extensive case study at a large Nordic distribution utility. The study shows that the IRM, with some adaptations, serves the purpose of functionally evaluating asset management applications.

  • 33.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Schönherr, Marten
    Johnson, Pontus
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Chenine, Moustafa
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Using Enterprise Architecture Models for System Quality Analysis2008Inngår i: EDOC 2008: 12TH IEEE INTERNATIONAL ENTERPRISE DISTRIBUTED OBJECT COMPUTING, PROCEEDINGS  , IEEE Computer Society, 2008, s. 14-23Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Enterprise Architecture is a model-based approach to business-oriented IT management. To promote good IT decision making, an Enterprise Architecture framework needs to explicate what kind of analyses it supports. Since creating Enterprise Architecture models is expensive and without intrinsic value, it is desirable to only create Enterprise Architecture models based on metamodels that support well-defined analyses. This paper presents the content and extension of a metamodel which supports creating models containing the information necessary to conduct system quality analyses, specifically with respect to availability, accuracy, confidentiality and integrity. The metamodel is an extension and formalization of the metamodel underlying the ArchiMate modelling language for Enterprise Architecture. The use of the extended metamodel is demonstrated in a case study where the availability, accuracy, confidentiality and integrity of the two Service Oriented Architecture (SOA) platforms Sun JCaps and PrOSeRO were evaluated.

  • 34.
    Närman, Per
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sommestad, Teodor
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Sandgren, Sofia
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    A Framework for Assessing the Cost of IT Investments2009Inngår i: PROCEEDINGS OF PICMET 09: TECHNOLOGY MANAGEMENT IN THE AGE OF FUNDAMENTAL CHANGE / [ed] Kocaoglu DF; Anderson TR; Daim TU; Jetter A; Weber CM, NEW YORK: IEEE , 2009, s. 3070-3082Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Assessing life cycle costs of IT is a difficult endeavor. There are several factors that contribute to the life cycle costs of IT. Many of these factors are of a technical nature, such as development costs or integration costs. A substantial part of the costs are, however, caused by organizational factors such as the changes the introduction of an IT-system impose on business processes and the temporary loss of productivity this causes, or the cost of training system users before taking the system into operation. This paper proposes a framework for IT investment cost assessment. The framework integrates factors as proposed by already existing IT cost estimation frameworks and literature on the subject to be able to take into account both technical and organizational factors and cost drivers related to IT life cycle costs. The framework assists in quantifying these factors together with the costs they influence thereby providing more complete and accurate decision-support to executives faced with having to make investment decisions. The paper also describes how the framework's usefulness has been validated in two case studies at a large Nordic power company.

  • 35.
    Per, Närman
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Enterprise Architecture for Information System Analysis: Modeling and assessing data accuracy, availability, performance and application usage2012Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Decisions concerning IT systems are often made without adequate decision-support. This has led to unnecessary IT costs and failures to realize business benefits. The present thesis presents a framework for analysis of four information systems properties relevant to IT decision-making. The work is founded on enterprise architecture, a model-based IT and business management discipline. Based on the existing ArchiMate framework, a new enterprise architecture framework has been developed and implemented in a software tool. The framework supports modeling and analysis of data accuracy, service performance, service availability and application usage. To analyze data accuracy, data flows are modeled, the service availability analysis uses fault tree analysis, the performance analysis employs queuing networks and the application usage analysis combines the Technology Acceptance Model and Task-Technology Fit model. The accuracy of the framework's estimates was empirically tested. Data accuracy and service performance were evaluated in studies at the same power utility. Service availability was tested in multiple studies at banks and power utilities. Data was collected through interviews with system development or maintenance staff. The application usage model was tested in the maintenance management domain. Here, data was collected by means of a survey answered by 55 respondents from three power utilities, one manufacturing company and one nuclear power plant. The service availability studies provided estimates that were accurate within a few hours of logged yearly downtime. The data accuracy estimate was correct within a percentage point when compared to a sample of data objects. Deviations for four out of five service performance estimates were within 15 % from measured values. The application usage analysis explained a high degree of variation in application usage when applied to the maintenance management domain. During the studies of data accuracy, service performance and service availability, records were kept concerning the required modeling and analysis effort. The estimates were obtained with a total effort of about 20 man-hours per estimate. In summary the framework should be useful for IT decision-makers requiring fairly accurate, but not too expensive, estimates of the four properties.

  • 36.
    Raderius, Jakob
    et al.
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Närman, Per
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Ekstedt, Mathias
    KTH, Skolan för elektro- och systemteknik (EES), Industriella informations- och styrsystem.
    Assessing System Availability Using an Enterprise Architecture Analysis Approach2009Inngår i: SERVICE-ORIENTED COMPUTING - ICSOC 2008 WORKSHOPS / [ed] Feuerlicht G, Lamersdorf W, Berlin: SPRINGER-VERLAG BERLIN , 2009, Vol. 5472, s. 351-362Konferansepaper (Fagfellevurdert)
    Abstract [en]

    During the last decade, a model based technique known as enterprise architecture has grown into an established approach for management of information systems in organizations. The use of enterprise architecture primarily promotes good decision-making and communication between business and IT stakeholders. This paper visualizes a scenario where enterprise architecture models are utilized to evaluate the availability of an information system. The problem is approached by creating models based on metamodels tailored to the domain of enterprise architecture analysis. As the instantiated models are fed with data particular to the information system, one can deduce how the organization needs to act in order to improve the system's availability.

1 - 36 of 36
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