A discussion on three critical issues for assuring quality of the users' requirements specification

The paper tries to step in a forbidden area of software engineering - to achieve the users' requirements specification of ideal quality in DIRPT (do it right the first time) way. The key idea happens to be a trilogy: modeling business relevant to the purpose of the software to be developed with a compact business model, defining a complete set of inhomogeneous users in conformity with the business model, and eliciting user's requirements by strictly adhering to correspondent user's definition. The result seems encouraging.