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Since the birth of software engineering, it always are recognized as one pureengineering subject, therefore, the foundational scientific problems are notpaid much attention. This paper proposes that Requirements Analysis, the kernelprocess of software engineering, can be modeled based on the concept of "commonknowledge". Such a model would make us understand the nature of this process.This paper utilizes the formal language as the tool to characterize the "commonknowledge"-based Requirements Analysis model, and theoretically proves that :1) the precondition of success of software projects regardless of cost would bethat the participants in a software project have fully known the requirementspecification, if the participants do not understand the meaning of the otherparticipants; 2) the precondition of success of software projects regardless ofcost would be that the union set of knowledge of basic facts of theparticipants in a software project can fully cover the requirementspecification, if the participants can always understand the meaning of theother participants. These two theorems may have potential meanings to proposenew software engineering methodology.

A Kind of Representation of Common Knowledge and its Application in Requirements Analysis