DOI: 10.4018/IJHISI.2016100102 International Journal of Healthcare Information Systems and Informatics Volume 11 • Issue 4 • October-December 2016 32 ABSTRACT Massive data to facilitate decision making for organizations and their corporate users exist in many forms, types and formats. Importantly, the acquisition and retrieval of relevant supporting information should be timely, precise and complete. Unfortunately, due to differences in syntax and semantics, the extraction and integration of available semi-structured data from different sources often fail. Needs for seamless and effective data integration so as to access, retrieve and use information from diverse data sources cannot be overly emphasized. Moreover, information external to organizations may also often have to be sourced for the intended users through a smart data integration system. Owing to the open, dynamic and heterogeneity nature of data, data integration is becoming an increasingly complex process. A new data integration approach encapsulating mediator systems and data warehouse is proposed here. Aside from the heterogeneity of data sources, other data integration design problems include distinguishing the definition of the global schema, the mappings and query processing. In order to meet all of these challenges, the authors of this paper advocate an approach named MAV- ES, which is characterized by an architecture based on a global schema, partial schemas and a set of sources. The primary benefit of this architecture is that it combines the two basic GAV and LAV approaches so as to realize added-value benefits of the mixed approach. KeywoRdS Data Integration, Data Warehouse, Decisional Information System, Epidemiological Surveillance, MAV-ES Mixed Approach, Mediation The MAV-eS data Integration Approach for decisional Information Systems (dIS): A Case on epidemiologic Monitoring Djamila Marouf, University of Oran 1 Ahmed Benbella, Oran, Algeria Djamila Hamdadou, University of Oran 1 Ahmed Benbella, Oran, Algeria Karim Bouamrane, University of Oran 1 Ahmed Benbella, Oran, Algeria 1. INTRodUCTIoN Epidemic prevention is a key public health concern. The basic strategy calls for identifying and using preventive measures and thoughtful management to eliminate and/or significantly reduce the impact of prevailing epidemics that can plague confined (urban and non-urban) residential areas and populations. Whereas the primary goal emphasizes increased efficacy of medical management of these diseases on targeted areas and populations, the use of information technology (IT) have often been purported to aid greatly the achievement of such an objective. In the case study presented here, we focus on the region of Oran in Algeria, an established geo-location residential area of populations where it is observed that places in which an epidemic could spread most rapidly and widely are places occupied mostly by those classified as having “low” socioeconomic status. Specifically, our study advocates an information framework that is defined by