Mutual requirements evolution by combining different information systems

We propose a method of eliciting requirements for several different systems together. We focus on systems used by one user at the same time become such systems inherently give influences on with other. We expect such influences help a requirements analyst to be aware of unknown requirements of the user. Any modeling notations are used to explore the combination among systems causing such influences because the differences among the notations give diverse viewpoints to the analyst. To specify such mutual influences, we introduce semantic tags represented by stereo types. We also introduce other semantic tags so that the analyst can judge whether the combination brings advantages to the user. We apply our method to an example and we confirm the method works.