Based on its characteristics, a SDSS is usually made up of (5) five modules:
A database management system containing the functions of manipulation of the geographical database, that is, the module that stores the spatial data that will be used for the analysis. Model Base Management System (MBMS) containing the functions for model use and management. That is, the module that stores various models relevant to the application at hand and the parameters required to build such model. Dialogue generation and management system which manages the interface between the user and the rest of the components of the system (Armstrong, Densham, 1990).