The competitive environment of companies triggers changes having impacts on the enterprise information system. In this context, Enterprise Architecture (EA) offers instruments to steer enterprises changes and to ensure cohesion and alignment between the different aspects of an enterprise. Despite considerable numbers of EA frameworks, there are not many giving importance to actors competencies supporting EA changes when modeling. In this paper, we present an approach based on competencies to support enterprises' changes. In doing so, we introduce a performance assessment method from the process modeling to the competence selection using a competence-oriented ontology. Moreover, we develop a prototype as an evaluation part of our work illustrated by a case study supporting EA decision making.

Abstract. In an evolutionary environment, many changes can be triggered by enterprise in order to cope with increased development. These changes can be critical if they are not well identified and addressed. In this context, Enterprise Architecture (EA) operates to provide holistic and coherent enterprise vision and aims to guide enterprise change. One of these changes depends on competence which is related to actors' performance assessment. In doing so, we define a formal approach that accompanies changes and provides strategic guidance based on actors performance assessments. Then, we identify the multilevel character of changes using hierarchical linear model (HLM) to compute linear correlation coefficient. Our method is based on the prediction and helps in anticipating the changing impacts. Finally, a prototype is developed to evaluate this approach in a case study.

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The urbanization of information system (U.I.S) is a fairly complex process because like all EA approaches around the world, it is based on a layered representation. In the context of modeling the EA layer is a point of view as a strategic, business, technical point of view etc... In addition, the information system (I.S) is not just a technical challenge, focused on information and IT support systems. On the contrary, everything indicates that the key issues within the organization and the human factor in business as well as their competence. So taking into account the changes in the organization is critical to the success of urbanization projects. Thus, organization models have been developed in the context of enterprise architecture (EA). These models aim to structure a holistic view of the enterprise. However, a semantic deficit was identified by several researches in these models. So, several studies have investigated to solve this problem by proposing ontologies as a semantic enrichment tool. Based on these works we built an ontology that aims to support the process of change in an UIS approach. Thus we present in this paper a first part summarizes the different ontologies developed for the company and in the second part we present a modular ontology oriented competence exploitable in the context of UISI. Then in the end we present the technical way to use this ontology.