Based on the requirement specifications and using the conceptual model of the phenomena (see Figure 2 in section 2.2), we designed a conceptual architecture of the WNV-MAGS system which includes all the needed system components and their relationships [32] . While constructing this architecture, we identified all the processes to be developed (represented as rectangles numbered as Pi in Figure 11 ) and all the data stores (represented as ovals numbered as Ai in Figure 11 ) that gather data and feed the system processes. Indeed, most of the necessary data are obtained from external databases (EPOQ [24] , Weather data, etc.) and GIS. They are represented as 'cylinders' at the bottom of Figure 11 .