This paper describes a case study on application of natural language processing in very early stages of the requirements engineering. In our previous work [7] we have shown how natural language processing can be applied to build an application domain model from the requirements document. In this paper we want to go one step further. We want to build an initial system model. To do so, we match the extracted application domain model and the meta model of the specification formalism. It turns out that such a matching is possible and it yields a sensible model, extensible to a full