ABSTRACT
In recent decades, computers have been mainly used for designing urban maps and storing appropriate data for urban management clerical works and to a lesser extent, for spatial analysis. But now, by means of the Internet, computer-supported co-operative works (CSCW) can be easily organised (Gronbaek et al. 1993, Malhing et al. 1995, Palmer et al. 1994). Known also as groupware these new techniques allow several persons, located in different places, to work together. This new mode of working appears very appealing for urban planners, especially for designing and assessing alternatives. One very important aspect is the use of GIS for public participation, especially facing new urban projects, but this issue will be developed in the next chapter.
