The best sustainable urban development strategy of another country cannot just be copied. Strategies can only be adapted into a real economic, social, political, legislation/regulation and provision situation of the existing state. There is no such thing as a single sustainable urban development strategy to suit all societies and that could be applied to all countries. Based on the analysis of existing information, expert and decision support systems and in order to determine the best practice of sustainable urban development and to prepare recommendations for countries under consideration a Web-Based Sustainable Urban Development Decision Support System consisting of a database, database management system, model-base, model-base management system and user interface was developed. Studying the expertise of advanced industrial economies formed the initial database of the best practice.