Abstract. Many methodologies have been introduced to deal with project portfolio selection problem including some techniques that help to evaluate individual projects, or to select a portfolio among available projects. This paper, however, provides several XML-based schemes for building efficient and flexible project portfolio selection systems based on an integrated portfolio selection model proposed. In additional to provide an interactive and adaptable portfolio selection management framework for the organizations, we also stress the use of XML to standardize the data representation for developing Webbased decision support systems with heterogeneous data sources and multiple decision models.