A View Based Approach for Enhancing Web Services Availability Hela Limam and Jalel Akaichi Abstract With the advance of Web services technologies and the emergence of Web services into the information space, tremendous opportunities for empowering users and organizations appear in various application domains including electronic commerce, travel, intelligence information gathering and analysis, health care, digital government. Hence, Web services appear to be a solution for integrating distributed, autonomous and heterogeneous information sources. However, as Web services evolve in a dynamic environment which is the Internet many changes can occur, affect them and make them become unavailable. This presents us with the problem of substituting them, while maintaining the whole Web service function- ality. In this paper, we propose an approach for solving this problem. We present several algorithms for solving several variants of this problem. Our work is illus- trated with a healthcare case study. Keywords Web services ⋅ Substitution ⋅ Schema changes ⋅ Healthcare 1 Introduction Synchronization within highly dynamic environments such as Internet is far away from being trivial. In fact it is the trickiest environment one could image due to its unpredictable behavior. Unfortunately, there is no satisfactory solution which guaran-tees Web service availability in such a situation. It makes sense to work on a solution for the usual scenario, which, anyway, has to deal with the unavailable Web services situation due to unemployment of individual Web services caused by changes which can alter their contents. Motivation for substitution includes Web H. Limam ( ✉ ) ⋅ J. Akaichi BestMod Laboratory, Institut Supérieur de Gestion, Tunis, Tunisia e-mail: Hela1.limam@laposte.net J. Akaichi e-mail: Jalel.akaichi@isg.rnu.tn © Springer International Publishing Switzerland 2015 Á. Herrero et al. (eds.), 10th International Conference on Soft Computing Models in Industrial and Environmental Applications, Advances in Intelligent Systems and Computing 368, DOI 10.1007/978-3-319-19719-7_2 15