In this paper we show the methodology we used to build a prototype for One-stop Government. We started by defining ten simple use cases, and then we developed scenarios, business rules and sequence diagrams for each of them. This work was based on a conceptual model for One-stop Government we developed in a previous research. We also explain why the use cases and the scenarios proved very helpful for the conception and the development of the prototype. Last we show the software architecture, based on distributed components, and the operation of the prototype with a few examples.
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