Spatial Information Management is gaining popularity and managers are beginning to appreciate the power and application of spatial modeling in decision support. A new breed of DSS called Spatial Decision Support System (SDSS) is emerging, which supports spatial data and spatial modeling. This paper highlights the importance of spatial modeling with an example, and presents an architecture for a SDSS, and discusses it components. A prototype of the environment is under development using ArcView, SpaceStat, Jess, and Visual Basic.