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This paper introduces graphical user interface (GUI) modelling approach and it positions in information system (IS) development process. The overview of graphical user interface design methods and methodologies is presented. The main objective of the proposal is the consistency of IS development process, which includes requirements specification, system design and implementation phases. The GUI modelling process is based on the data flows specification. Detailed explanation of modelling steps is presented. Paper includes an illustrative example of the web based GUI development according to the proposed process. [ABSTRACT FROM AUTHOR]