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This paper presents a new method for deriving system models based on business process models. The congruence between the central notion of `automated activity' in improved RAD model and that of `process' in DFD facilitates the linking process. This method led to develop system model on early stage and without going through expensive system analysis and design process. The process of cancer registration in Jordan is used to demonstrate the proposed approach and showing its ease and timeliness. Finally, further work is planned to validate and evaluate the proposed method using several cases with different domains.