URBIS is a computer program built for AutoCAD environment (AutoLisp) which purpose is to help in urban planning's education and practice. Motives for program creation are: (1) Needs of education at the Faculty of Architecture of the Belgrade University. (2) Exploring the AutoCAD's capabilities in managing urban planning data bases. (3) Providing a tool for creation and manipulation of urban environment computer model. (4) Making a base for knowledge based system creation. (5) Computer based evaluation of the results of the competition “Future of New Belgrade”. // The program consists of: (1) Module for model creation. (2) Module for model manipulation - remodelling. (3) Module for obtaining data from the model. // Some commands and procedures from these three modules are organized as ARCHIGAME module - a kind of game for architects. The computer model of New Belgrade was created using this program, and three remodelations were done on the model, as the test-examples.