MICROSIMULATION MODELS USING WEB SERVICES Istvan Molnar School of Business, Department of Computer and Information Systems Bloomsburg University of Pennsylvania, Bloomsburg, Pennsylvania, 17815, U.S.A. E-Mail: imolnar@bloomu.edu KEYWORDS: Microsimulation, Socioeconomic applications, Microsimulation software, Web services, ABSTRACT This paper describes and analyzes new Webbased application development software technologies, which can be applied to develop microsimulation models. First, the application field and some of its major characteristics and requirements are introduced. After a short introduction and classification of microsimulation models, basic technological approaches for microsimulation model implementations are introduced. Next, two major technologies, the database-oriented and the weboriented approaches are discussed in details. The Web services approach, as a very promising new technology, is analyzed in more detail, because of its potential to develop Web-enabled model bases. The two major solutions for realizing Web services are J2EE and .NET. These two technologies are compared and their impact on microsimulation and related software technology shortly discussed. Final remarks conclude the paper.