Bringing together the ICT and the business layer of a service-oriented system (SoS) remains a great challenge. Few papers tackle the management of SoS from the business and organizational point of view. One solution is to use the well-known ITIL v.3 framework. The latter enables to transform the organization into a service-oriented organizational which focuses on the value provided to the service customers. In this paper, we align the steps of the service provisioning model with the ITIL v.3 processes. The alignment proposed should help organizations and IT teams to integrate their ICT layer, represented by the SoS, and their business layer, represented by ITIL v.3. One main advantage of this combined use of ITIL and a SoS is the full service orientation of the company.
@cite_4 , the authors propose a meta model of an enterprise service based on the service concept of itil v. 2 and of the service-oriented paradigm. They do not tackle the possible relations between the itil processes and the activities of the s o s implementation and provisioning. works such as @cite_17 use itil v. 3 concepts to build a service-oriented and organizational framework. But they do not align the processes of itil with processes or activities of an s o s implementation or provisioning methodology.
@cite_4 @cite_17
2046870826 2024250897 2151597242 1965810726
Enterprise architecture supports organizational engineering in many ways. Service orientation is regarded as dominant operations model for service providers -- within and beyond IT. As a consequence, it is important to integrate service management and service orientation into enterprise architecture. This paper proposes an enterprise architecture extension that achieves such an integration. IT service management is defined according to ITIL. Based on the integration of service management into enterprise architecture, the integration of Service Oriented Architecture is discussed as a further extension. The research is based on the Business Engineering approach and the guidelines of Method Engineering. Service Oriented Architectures enable a multitude of service providers to provide loosely coupled and interoperable services at different Quality of Service and cost levels. This paper considers business processes composed of activities that are supported by service providers. The structure of a business process may be expressed by languages such as BPEL and allows for constructs such as sequence, switch, while, flow, and pick. This paper considers the problem of finding the set of service providers that minimizes the total execution time of the business process subject to cost and execution time constraints. The problem is clearly NP-hard. However, the paper presents an optimized algorithm that finds the optimal solution without having to explore the entire solution space. This algorithm can be used to find the optimal solution in problems of moderate size. A heuristic solution is also presented. Thorough experimental studies, based on random business processes, demonstrate that the heuristic algorithm was able to produce service provider allocations that result in execution times that are only a few percentage points (less than 2.5 ) worse than the allocations obtained by the optimal algorithm while examining a tiny fraction of the solution space (tens of points versus millions of points). Enterprise Architecture models can be used to support IT business alignment. However, existing approaches do not distinguish between different IT business alignment situations. Since companies face diverse challenges in achieving a high degree of IT business alignment, a universal ‘one size fits all’ approach does not seem appropriate. This paper proposes to decompose the IT business alignment problem into tangible qualities for business, IT systems, and IT governance. An explorative study among 162 professionals is used to distinguish four IT business alignment situations, i.e. four clusters of IT business alignment problems. These situations each represent the current state according to certain qualities and also the priorities for future development. In order to increase IT business alignment, enterprise architecture meta models are proposed for each identified situation. One core meta model (to reflect common priorities) as well as situation specific extensions are presented. Service-Oriented Architecture (SOA) provides a flexible framework for service composition. Using standard-based protocols (such as SOAP and WSDL), composite services can be constructed by integrating atomic services developed independently. Algorithms are needed to select service components with various QoS levels according to some application-dependent performance requirements. We design a broker-based architecture to facilitate the selection of QoS-based services. The objective of service selection is to maximize an application-specific utility function under the end-to-end QoS constraints. The problem is modeled in two ways: the combinatorial model and the graph model. The combinatorial model defines the problem as a multidimension multichoice 0-1 knapsack problem (MMKP). The graph model defines the problem as a multiconstraint optimal path (MCOP) problem. Efficient heuristic algorithms for service processes of different composition structures are presented in this article and their performances are studied by simulations. We also compare the pros and cons between the two models.